I have a hand made jewelry business. At this point I do not make enough to pay myself a salary. Do I track my labor costs under Labor Costs in schedule C?

When I look at the IRS site for labor costs I interpret it as saying you can only track where you have paid for the labor (e.g. given yourself a salary).  Am I misinterpreting that?  Can I track my labor costs for making the jewelry and the time spent at shows selling it?