Does anyone know how to do inv. assemblies in OL like in Desktop? Bundles don't work for sale items that are made up of many raw materials or multiple inv. assemblies.

I can see the importance of being able to account for raw materials in QuickBooks Online (QBO), BS30.

You can let our product team know how these features benefit your business needs by sending feedback. You can visit our Customer Feedback page and click the Give feedback option to submit the requests. I've added a screenshot for your reference:

In the meantime, you can check out this article so you'll know how to track inventory in QBO: Set Up And Track Your Inventory In QuickBooks Online.

Moreover, you might want to gather inventory data for your business. QuickBooks offers several reports that you can use so you'll be able to get the information you need. Consider reading this article for your guidance: Run Reports In QuickBooks Online.

Let me know if you have further questions about inventory. I'll be one post away if you need help.

@BS30 

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