I'm sure this has been answered somewhere in the forum, I just don't know how to find it.

I bag parts for my parent company.  I buy the bags on a roll of 3,000 bags.  The parts I manufacture only consume one of those bags.  How do I set up the BOM and/or roll of bags product so that it decrements one bag off the roll, which in turn decreases the number of rolls I have on hand.

Thank you!