Sparky66:
Invoice consists of a description of the work performed, details are provided on a "as-needed" basis, dependent on the customer.
Big ticket type of materials are broken-out separately, with mark-up "hidden" on the printed invoice. Labor is detailed as "x men for xhours (or "8:00 to 2:00") with a labor total. Permit fees are itemized, with a copy of the permit attached to the Invoice.
OH is in the Labor rate, and the materials mark-up.
We use "QuickBooks".
For T&M billing, we run an "Excel" spreadsheet for labor & materials, and attach & reference it on a Invoice rather then listing all the info again.

John


John