Thanks for following this thread, @LynB756. I'm here to guide you in pulling up a report with a list of all the assemblies with their associated sub-assemblies for a specific inventory item. 

Here's how:

1. Go to the Lists menu, then select Item list. 
2. Click the Customize button.
3. Find and select your inventory assembly to see the list showing all of the parts involved with your assembly.

I'm also adding this article to guide you in customizing reports in QuickBooks Desktop. 

Feel easy in posting some more of your concerns here in the Community. I'd be glad to be your QuickBooks guide. Have a great day ahead!