Welcome to the Community, agbenra.
Let me share some information about the availability of building assemblies in QuickBooks Online (QBO) Plus.
At this time, building an Inventory Assembly Item is only available in QuickBooks Desktop. While this is not an option in QBO, you can use the bundle feature as an alternative.
A bundle is a group of items that you sell and track together in QuickBooks. To give you more information bout this, check out this article: Product and Service Types.
You may also want to consider using a third party application in creating assembly and item group transactions. You can search for applications through the Apps menu of your QBO, then click Find Apps tab.
Another way is by following the steps below to route you to QuckBooks Apps:
All the applications listed are verified and approved by our product engineers to work best with QuickBooks Online.
I'll be right here if you have further questions. Keep safe and have a good one.
There is no assembly feature in QBO. You have to utilize a 3rd party app and integrate it with QBO. Explore these apps
https://www.sosinventory.com/ --- > send a private message to us to claim Promotion Code 10% off /month for 12 months prior to register the 15-days trial peiod.