Level 1

Summarizing time sheet data on invoice

We are a professional services entity using QuickBooks Premier Professional Services Edition 2019 Pro (Desktop). We currently use a third party time reporting system to capture time details.  Detailed time is imported into QuickBooks, but I cannot figure out how to create a summarized invoice (by item).  When you click "Add Time/Costs" there is no time data.  The invoice is imported directly into the invoice template. I would appreciate any guidance anyone would be able to provide.  Do I need to import timesheets in versus into the template?  Is there some way to modify the invoice template to include the ability to summarize the data?