Odoo 10: Ungroup Purchase Orders and User permissions -- 2

Hi, We are developers deploying a simple Odoo instance to a customer. There's 2 jobs: ------------------------------------ PURCHASE ORDER SPLITING In the actual workflow, when a quotation is approved, is generated a PURCHASE ORDER to the specific vendor. If we do the same with other customer and same vendor, Odoo group the 2 sales orders in 1 purchase. We want to generate 1 purchase order for each sales order. SO001 -> Customer Y -> 1 product of Provider X SO002 -> Customer X -> 1 product of Provider X The system unify the 2 purchase orders into 1 purchase order. ---------------------------- READ ONLY USERS FOR STOCK We want to generate a user profile to only see our stock levels (no customers, no anything, just Variant and Quantity in Stock).