Yes, there's an easy way to correlate markup material to a labor category in QuickBooks Desktop (QBDT), @CCCBuilder. I'm here to walk you through the process for a seamless experience.

Since you have already enabled the Markup feature in QuickBooks, you can now add a markup percentage on your items. Here's how:
 

1. In your QBDT file, go to the Lists menu, then select Item List.
2. Locate and select the item you want to add a markup.
   
   
    
3. Click on Edit Markup.
   
   
    
4. Select the Type of Markup you want on the dropdown.
   
   
    
5. Make sure to add a Cost and Markup Amount.
   
   
    
6. Once ready, click on OK to save.

Please note that the markup amount won't show when creating a bill in QuickBooks. It'll instead reflect on the invoice when creating one. Kindly refer to the images below for visual reference. Note: The images contain dummy names.

Moreover, if you consider adding a default markup percentage on all of your items in the future, here's how:
 

1. In your QBDT file, click on the Edit menu, then select Time & Expenses.
2. Go to the Company Preferences section.
3. Add an amount in the Default Markup Percentage field.
4. Select OK to save.
   
   

If you require additional aid with your inventories and transaction forms, please let me know by leaving a response below. I am ready to assist you in any way possible.