A progress-invoice spreadsheet for a T&M build
One sheet for one draw on a long build. It has 25 rows for labor, 15 for parts and 8 for sublet, and a place at the top for the shop, the customer, the car, the invoice number and the dates the draw covers.
Type each stretch of work on its own labor row: the date, the tech, the task, the hours and the rate. Type each part with its quantity and price, and each sublet bill with its amount. Enter your shop supplies percentage if you charge one. The totals fill themselves in: each row's amount, the three subtotals, the supplies charge and the total for the draw.
The sales tax rate and the amount it applies to are yours to enter.
Bay to Bill builds the same invoice from the hours your techs clock and the parts you log.