Is bill of material and inventory assembly feature available in QBO?

You need a 3rd party app with the assembly feature to integrate with QBO.

Let me share some details about the inventory assembly feature in QuickBooks Online (QBO), adnanhashmi01.

The bill of material and inventory assembly functionality is unavailable in QuickBooks Online (QBO). This is only available in the QuickBooks Desktop (QBDT) version. There's a similar feature here in QBO called Bundle that helps you easily add multiple items to transactions. If you need this feature, here's how to set it up:

1. On the left panel, select Sales.
2. Go to Product and services.
3. Click the New icon beside the More option.
4. There will be a pop-up box, choose Bundle.
5. Fill in the necessary information. And in the PRODUCT/SERVICE, you'll include.
6. After that, click Save and close.

You can check out this article for the steps and details: Product and service items to QuickBooks Online. If your business needs an inventory assembly feature, you can look for a third-party app to have that feature integrated into QBO.  Let me guide you on how:

1. You can find a related app here: QuickBooks Apps. 
2. From the left menu, select Apps.
3. Head to the Find apps section.
4. Look for the app in the search bar or click the Browse category drop-down.

Then, you can go ahead and download it. You can check out this article to learn more about managing your inventories: Adjust inventory quantity on hand in QuickBooks Online.

I'm all ears if you have concerns about processing inventory or any QuickBooks-related. If you also need to take care of other things like running reports, let us know. My colleagues and I will reply as soon as possible.