Initial ideas of having product level 'Planning Policy' for grouping and limiting where items can be planned from and how.

sale_planner/models/product.py

@@ -0,0 +1,22 @@
+from odoo import api, fields, models
+
+
+class ProductTemplate(models.Model):
+    _inherit = 'product.template'
+
+    property_planning_policy_id = fields.Many2one('sale.order.planning.policy', company_dependent=True,
+        string="Order Planner Policy",
+        help="The Order Planner Policy to use when making a sale order planner.")
+
+    @api.multi
+    def get_planning_policy(self):
+        self.ensure_one()
+        return self.property_planning_policy_id or self.categ_id.property_planning_policy_categ_id
+
+
+class ProductCategory(models.Model):
+    _inherit = 'product.category'
+
+    property_planning_policy_categ_id = fields.Many2one('sale.order.planning.policy', company_dependent=True,
+        string="Order Planner Policy",
+        help="The Order Planner Policy to use when making a sale order planner.")