Seek help! Purchase orders cannot be ordered separately from different suppliers through the BOM

Hello everyone, my company’s product BOM materials are purchased by different suppliers. The problem I am encountering now is :

  1. After using the BOM to generate the “material requirements”, when generating the “purchase order”, “enter supplier” can only select one, and cannot be automatically divided into multiple suppliers with different “purchase orders” (I have set the supplier for each item).
  2. The purchase order cannot automatically fill in the quantity required for purchase according to the existing inventory quantity (demand quantity - existing inventory quantity).
  3. When making “material requirements” and “purchase orders”, I choose to show the warehouse (available quantity), but it does not work well. I hope a friend can guide me, thank you!