I can share some information that can help you with showing the components you used for your assembly items, @angel511.

The custom report that was provided by AlcaeusF and DebSheenD above will only be generated once you assemble your products (Build Assemblies). 

The option to run a report that shows all your assembly items with their components is currently unavailable. However, you can follow the steps provided by AlcaeusF above and then click on each building assembly to open the Build Assemblies window to see the components you used to build the assembly item. 

If you're only trying to see all your components, you may consider running the Item Listing report. You can customize the Item Listing report to view your inventory items or the components you use to build your products. 

Here's how:

1. Go to the Reports menu, and hover to Lists.
2. Select Item Listing.
3. Go to the Filters tab and click on Item. 
4. Select All inventory items. 
   
5. Set all other information for this report.

You can refer to this article for more information about adding or deleting columns, and information, and personalizing the font and style of the report: Customize reports in QuickBooks Desktop. 

Then, check out the following article on how you can set up all the parts and add them to your bill of materials, you can start building your products: Track the products you manufacture.

Let me know if you need more help running the report that you need. I'm always here to assist. Have a wonderful day!