Make or Buy scenario - Epicor 9.05

We have a scenario that I need help with. We make a widget that requires 1 flange to be attached to each widget to make a completed product for sale.

We have two divisions - 01 and 02

I can either make the flange in house (using Division 02), or I can purchase it from a vendor.

I dont know if I will make it internally or purchase it until I see the demand and have it quoted.

I do not have multi-company capability.

I prefer not to treat division 02 as a vendor.

I need to be able to hold division 2 accountable for cost in profit and loss for their manufacture of the flange.

Does anyone currently have a process like this that can offer some advice and direction on proper set up from a cost and planning perspective?