The MRP process in Dynamics GP Manufacturing can be easy to use. It considers current inventory levels, open purchase orders, and product demand to determine which new purchase orders need to be created and which workorders need to be created in order to meet forecasted demand.
The sales forecasting module in Dynamics GP Manufacturing is very useful for this. But if you’re not licensed for it, here’s another way to do it:
You can configure MRP to look at sales quotes to get demand information for its calculations. So all you need to do is to create a sales quote that has all the items you want to forecast, the quantity you want to forecast and the date that the items need to be available.
This video shows how you can use sales quotes to maintain and manage sales forecasts in Dynamics GP: http://youtu.be/PwDQayepDm8