How can I do a minus or recredit on my invoices

Hi there, @masonrymartini-g. To ensure I’m pointing you to the right direction, when you say "minus or recredit my invoices," do you mean reducing what a customer owes, or lowering a bill from a supplier? 

If you're trying to minus an amount from what a customer owes, you’ll want to use a Credit memo. You can do this by going to the + Create button in the top left corner and selecting Credit memo under the Customers column. It creates a credit that you can then apply directly to their open invoices to reduce their outstanding balance.
 

You can view this article for the step-by-step instructions on how to process a credit memo: Create and apply credit memos or delayed credits in QuickBooks Online.

On the other hand, if you’re looking to reduce a bill you received from a supplier, you’ll use a Supplier credit. This acts as a deduction against that specific vendor, so when you go to pay them, QuickBooks will subtract that credit from the total amount you owe.
 

This article guides you through entering supplier credits, specifically the If you enter bills you plan to pay later section: Enter supplier credits and refunds in QuickBooks Online.
 

If you had something different in mind or need further assistance, just let us know. We’re always here to help.