In sap there is specific transaction flow for a particular Manufacturing Process. It all depends upon the requirement of client and process.
Here is the basic flow of transactions which is req. for creating master data, planning and order processing…
The Made TO Order Cycle:
The sale department passes on the Made to order-Sales Order to the Material department so that material requirement is analyzed. This is done in SAP by carrying on an MRP Run for all the levels of the product BOM. This MRP Run would create Planned Orders for the shortages. Here the planned orders for fert sub assemblies, Components etc, are created.