tra_backend/diet_template/views/diet_view.xml

<odoo>

    <!-- Form view of Diet Plan lines -->
    <record id="view_diet_plan_lines_form" model="ir.ui.view">
        <field name="name">view.diet.plan.lines.form</field>
        <field name="model">diet.plan.lines</field>
        <field name="arch" type="xml">
            <form>
                <sheet>
                    <group>
                        <field name="interval"/>
                    </group>
                    <group string="Food Items">
                        <field name="food_item_ids" nolabel="1">
                            <tree editable="bottom">
                                <field name="food_name_id"
                                       domain="[('is_food','=',True)]"
                                       context="{'form_view_ref':'diet_template.view_food_item_product_form','default_is_food':True}"/>
                                <field name="quantity"/>
                                <field name="measure_unit_id"/>
                            </tree>
                            <form>
                                <group>
                                    <field name="food_name_id"/>
                                    <field name="quantity"/>
                                    <field name="measure_unit_id"/>
                                </group>
                            </form>
                        </field>
                    </group>
                </sheet>
            </form>
        </field>
    </record>

    <!-- Tree view of Diet Plan lines -->
    <record id="view_diet_plan_lines_tree" model="ir.ui.view">
        <field name="name">view.diet.plan.lines.tree</field>
        <field name="model">diet.plan.lines</field>
        <field name="arch" type="xml">
            <tree>
                <field name="interval"/>
                <field name="food_item_ids"/>
            </tree>
        </field>
    </record>

    <!-- Action of Diet Plan lines -->
    <record id="action_diet_plan_lines" model="ir.actions.act_window">
        <field name="name">Diet Plan</field>
        <field name="type">ir.actions.act_window</field>
        <field name="res_model">diet.plan.lines</field>
        <field name="binding_view_types">form</field>
        <field name="view_mode">tree,form</field>
    </record>

    <!-- Form view of Diet Plan  -->
    <record id="view_diet_plan_form" model="ir.ui.view">
        <field name="name">view.diet.plan.form</field>
        <field name="model">diet.plan</field>
        <field name="arch" type="xml">
            <form>
                <sheet>
                    <group>
                        <h1>
                            <field name="name"
                                   Placeholder="e.g Diet Plan For Kids"/>
                        </h1>
                        <separator string="Diet Plan" colspan="4"/>
                        <field name="diet_plans_ids" nolabel="1"/>
                    </group>
                </sheet>
            </form>
        </field>
    </record>

    <!-- Tree view of Diet Plan  -->
    <record id="view_diet_plan_tree" model="ir.ui.view">
        <field name="name">view.diet.plan.tree</field>
        <field name="model">diet.plan</field>
        <field name="arch" type="xml">
            <tree>
                <field name="name"/>
                <field name="diet_plans_ids" widget="many2many_tags"/>
            </tree>
        </field>
    </record>

    <!-- Action of Diet Plan lines -->
    <record id="action_diet_plan" model="ir.actions.act_window">
        <field name="name">Diet Plans</field>
        <field name="type">ir.actions.act_window</field>
        <field name="res_model">diet.plan</field>
        <field name="binding_view_types">form</field>
        <field name="view_mode">tree,form</field>
    </record>

    <!-- Form view of food item-->
    <record id="view_item_form" model="ir.ui.view">
        <field name="name">view.item.form</field>
        <field name="model">food.item</field>
        <field name="arch" type="xml">
            <form>
                <sheet>
                    <group>
                        <group>
                            <field name="food_name_id"
                                   domain="[('is_food','=',True)]"
                                   required="1"/>
                            <field name="quantity"/>
                        </group>
                    </group>
                </sheet>
            </form>
        </field>
    </record>

    <!-- Tree view of food item -->
    <record id="view_item_tree" model="ir.ui.view">
        <field name="name">view.item.tree</field>
        <field name="model">food.item</field>
        <field name="arch" type="xml">
            <tree>
                <field name="food_name_id"/>
                <field name="quantity"/>
            </tree>
        </field>
    </record>

    <!-- Action of food item -->
    <record id="action_food_item" model="ir.actions.act_window">
        <field name="name">Food Items</field>
        <field name="type">ir.actions.act_window</field>
        <field name="res_model">food.item</field>
        <field name="binding_view_types">form</field>
        <field name="view_mode">tree,form</field>
        <field name="domain">[('is_food','=',True)]</field>
        <field name="context">{"food_default":True}</field>
    </record>

    <!-- Form view of Food Product-->
    <record id="view_food_item_product_form" model="ir.ui.view">
        <field name="name">view.food.item.product.form</field>
        <field name="model">product.template</field>
        <field name="arch" type="xml">
            <form>
                <sheet>
                    <field name="image_1920"
                           widget="image" class="oe_avatar"/>
                    <div class="oe_title">
                        <label class="oe_edit_only"
                               for="name" string="Food Name"/>
                        <h1>
                            <field name="name" placeholder="Food Name"/>
                        </h1>
                    </div>
                    <notebook>
                        <page string="Nutrition Information">
                            <table border="1" style="width:100%; height:100%">
                                <tr>
                                    <td class="text-align:center;">
                                        <style>h4 {text-align: center;}</style>
                                        <h4>
                                            <separator
                                                    string="Nutrition Information"
                                                    colspan="4"/>
                                        </h4>
                                    </td>
                                </tr>
                            </table>
                            <group>
                                <group>
                                    <field name="unit_id" widget="selection"
                                           />
                                    <field name="calorie"/>
                                    <field name="protein"/>
                                    <field name="carbohydrates"/>
                                </group>
                                <group>
                                    <field name="fat"/>
                                    <field name="fibres"/>
                                    <field name="sodium"/>
                                </group>
                            </group>
                        </page>
                        <page string="General Information">
                            <group col="4">
                                <field name="type"/>
                                <field name="list_price"/>
                                <field name="categ_id"/>
                                <field name="taxes_id"
                                       widget="many2many_tags"/>
                                <field name="default_code"/>
                                <field name="standard_price"/>
                            </group>
                            <group string="Internal Notes">
                                <field name="description" nolabel="1"/>
                            </group>
                        </page>
                    </notebook>
                </sheet>
            </form>
        </field>
    </record>

    <!-- Tree View of Food Product -->
    <record id="product_template_food_tree_view" model="ir.ui.view">
        <field name="name">product.template.food.product.tree</field>
        <field name="model">product.template</field>
        <field name="priority">60</field>
        <field name="arch" type="xml">
            <tree string="Product">
                <field name="name"/>
                <field name="unit_id" widget="selection" required="1"/>
                <field name="calorie"/>
                <field name="protein"/>
                <field name="carbohydrates"/>
                <field name="fat"/>
                <field name="fibres"/>
                <field name="sodium"/>
            </tree>
        </field>
    </record>

    <!-- Action of Food Product -->
    <record id="action_food_food_item" model="ir.actions.act_window">
        <field name="name">Food Items</field>
        <field name="type">ir.actions.act_window</field>
        <field name="res_model">product.template</field>
        <field name="binding_view_types">form</field>
        <field name="domain">[('is_food','=',True)]</field>
        <field name="context">{'default_is_food':True}</field>
        <field name="view_mode">kanban,tree,form</field>
        <field name="help" type="html">
            <p class="oe_view_nocontent_create">
                Click to add a new Food Item.
            </p>
        </field>
    </record>

    <!-- Binding the action of Food to Kanban -->
    <record id="view_food_product_kanban_bind"
            model="ir.actions.act_window.view">
        <field name="view_mode">kanban</field>
        <field name="sequence">0</field>
        <field name="view_id" ref="product.product_template_kanban_view"/>
        <field name="act_window_id" ref="action_food_food_item"/>
    </record>

    <!-- Binding the action of Food to Tree -->
    <record id="view_food_product_tree_bind"
            model="ir.actions.act_window.view">
        <field name="view_mode">tree</field>
        <field name="sequence">1</field>
        <field name="view_id" ref="product_template_food_tree_view"/>
        <field name="act_window_id" ref="action_food_food_item"/>
    </record>

    <!-- Binding the action of Food to Form -->
    <record id="view_food_product_form_bind"
            model="ir.actions.act_window.view">
        <field name="view_mode">form</field>
        <field name="sequence">2</field>
        <field name="view_id" ref="view_food_item_product_form"/>
        <field name="act_window_id" ref="action_food_food_item"/>
    </record>

    <!--Parent Menu  -->
    <menuitem 
        id="menu_diet_main" 
        name="Diet"
        sequence="13"
        web_icon="diet_template,static/description/icon2.png"
    />

    <menuitem 
        id="menu_food_item" 
        action="action_food_food_item"
        parent="menu_diet_main" 
        sequence="5"
        groups='gym.group_gym_operator'
    />

</odoo>