I'd typically used the COGS section of the program to enter the parts I'd bought and sold. I'm just not really sure which year to count the expense/COGS on.
For my example, say I invoiced $100 to a customer on 12/1/19. That included a $25 part bought on 12/1/19 on credit card. I received payment for $100 in January 2020. Just an examaple
