1. Configure advanced stock management: Shop warehouse, Manufacturers warehouses (different delivery date);
2. MAIN TASK: Create quantity(stock) update plugin to update stock from uploaded xls file (connecting by manufacturer+ean13).
3. 2 types of xls files:
3.1. Shop warehouse (contains products of multiple manufacturers)
3.2. Manufacturers warehouses
4. If quantity on all stocks goes to 0 set product as inactive.