To add the same charge or credit to multiple Users' pending invoices, you'll need to:
Click on Users and select All Users from the left-hand menu
Filter by the Users you'd like to add the new charge/credit
Click More on the blue banner at the bottom of the page
Select Bulk Charge/Credit
Select the Invoice item type that you'd like to add and fill in the details
Click Done
Need more info on Invoices?