This post will show you how to print out a custom form field on the invoice. In this example, I’ve added a custom form field called Resolution to the Job Form. This field allows the technician to record the solution to the problem. First, go to Settings > Customize > Templates and select the Invoice Template to edit. We are going to place the special tag below on the Invoice template. _TicketCustomFields_ Step 1. Step 2. Step 3. Click the Save button. Step 4. Print out an invoice.