How can you mark up items automatically on an invoice?

I'm here to ensure you'll be able to markup your items automatically without any further delay, mark197.

Here's how:

1. From the Gear icon, choose Account and Settings.
2. Select the Expenses tab.
3. From the Bills and Expenses section, enable the Make expenses and items billable.
4. Put a checkmark on Markup with a default rate of tickbox.
   • Make sure to indicate the percent of the mark-up.  
5. Click the Save button, then Done. 

After that, you can set up the account where the Markup income will be recorded. I'll guide you how:

1. From the Account and Settings window, select the Advanced tab.
2. Click the pencil icon on the Chart of Accounts section.
3. Select your desired income account from the Markup income account drop-down list.
4. Click the Save button, then Done.

Furthermore, I encourage you to check out this guide to learn more about creating billable expenses: Billable Expenses.

I'm also adding this article that'll help you see the status of your inventory, the best sellers, the cost of goods, and more. This way, you'll be able to keep track of your items: Use Reports To See Your Sales And Inventory Status.

Keep us updated if you have other concerns in managing your QuickBooks transactions by clicking the Reply button. This helps us assist you on time.