Thank you for joining this thread, @jeffhhpllccpas.

Markup only applies to vendor bills, expenses, or timesheets. Adding markup to estimates will cause confusion since this form usually is what customers see and approves when you sent them. If you want to add billable expenses/ time in the estimates this is currently unavailable. The workaround you can use for this is to add a service item and enter the markup amount on your estimates. To do so, you may follow the steps provided by my colleague, @HoneyLynn_G.

Then, I encourage you to visit our QuickBooks Blog site so you'll be updated about the latest news and product developments. 

Also, QBO makes it easy to personalize your sales forms. For the detailed instructions, see this article: Customize invoices, estimates, and sales receipts in QuickBooks Online. 

Feel free to post here again if you need further assistance in adding markup items in QuickBooks. I'll be always around if you need help. Have a good one.