To get a sum value of all the invoices in the Invoices Report:
- Make a new bookmark and paste this code in the URL field (ie. bookmark this code as a page):
Name it as you like (eg. AC-invoices-sum)
Go to Active Collab and run the Invoice Report
Click on the bookmark you created and you'll get the sum value of all the invoices
Credit: jayshields for the original script that gives you a sum total of the grouped invoices on the Invoices Page.