I did not see a specific way to add feedback to this page:
https://help.quicken.com/pages/viewpage.action?pageId=3217023
If you are trying to add a way to invoice expenses and found that page (and then this post), you need to add the "Expense" column to the register you are adding the transaction to as it is not defaulted to be shown. An important step that Quicken help file creators have left out. Once you add the field to be shown in the register, you can then proceed with the steps on the linked page