opentaps allows you to reverse assemble a manufactured product into its original Bill of Materials parts. In a reverse assembly, the manufactured product is the raw material used and the parts are the output produced by the production run. When the production run is started, you would issue the finished product, and when it finishes, you would stock in the parts. The quantities produced of Part 1 and Part 2 are based on the quantities of the Bill of Materials multiplied by the quantity of the finished product isued. A reverse assembly goes only one level down in the Bill of Materials, so if Machine A is made from Part 1 and Part 2, and Part 2 is made from Part 3 and Part 4, a reverse assembly of Machine A would leave you with Part 1 and Part 2. If you want to disassemble Part 2 into Part 3 and Part 4, a separate reverse assembly must be run for it as well.
For information about cost accounting, see Cost Accounting for Reverse Assembly.