1 Create Product Variants

2 Create Bills of Materials (BoM) for Product B

Create a Bill of Materials (BoM) for each variant of Product B (Red, Blue, Green).

3 Configure the Work Center
Set up the "Drill" Work Center and define the operations it will perform on Product A to produce Product B.
4 Create Manufacturing Orders
The Manufacturing Order will automatically pull in the corresponding Product A variant as a component and assign the correct Bill of Materials.