I'm happy to see you here in the Community, @Carol Welch.
Having you print a CIS invoice with subtotal is my priority and I can walk you through on how to accomplish this.
A subtotal is a default detail on your invoices and will appear on your invoice once there are taxes applied to the transaction. I've attached some screenshots below for your visual reference:
To give you more details in handling CIS transactions and customising templates in QuickBooks Online, please see the following links:
This should get you covered today, Carol.
Don't hesitate to reach back out to me should you have any other questions about this. I'm always here to lend a helping hand. Take care!