How do i do an invoice for a customer who is CIS cant find the column to put 20% off invoice

 Hello Georginamercer72, 

Welcome to the Community page, 

You need to make sure that the customer is set up as CIS first and then when creating the invoice that you use the proper codes for the cis. Here is some articles to have a look at to help you and they have all the steps you need to do as well. 

CIS guide in QuickBooks Online 

How to add contractors or subcontractors in QuickBooks Online 

How to create CIS transactions in QuickBooks Online