Welcome to the Community space, @jspence580graphics.
Currently, the option to set up a Service Charge that is automatically listed on all new estimates and invoices is unavailable. You will have to set up the service item and manually add it when creating sale transactions.
This is to make sure that you're selecting the correct items and you can review the transaction details.
If you have other invoice and estimate questions, just leave a comment below. I'll be around to help you more.