It is possible to edit the bookings in a Manufacturing Order (MO) by editing the booked quantities with buttons "Add a booking" and "Return to stock" in the materials section of the MO. This easily allows you to reduce materials or add extra materials if needed.
When you are finishing a MO, then if not all materials are marked as consumed, the software will ask you whether you would like to release or consume the unused.
If you are reporting consumed materials with the function "Consume parts for end-products", then the software will consume all parts according to its BOM. If there are extra materials needed (e.g. you overproduce), the software will try to automatically make extra bookings if these have not been made manually earlier.
Please take note, if you change a BOM, this will not influence any MO that was created previously.
See more in User Manual