Is there anyway to batch upload bundles (e.g. via csv)? For example, if I have 4 items: A, B, C, and D and would like to create a bundle for every combo: AB AC AD, etc.

You're in the right place, Sherif.

I can see that the ability to upload the item in a batch bundle is handy for you, but it isn't possible in QBO. 

Another way to achieve this is to upload your products and services in QBO and manually bundle them there. Here's how: 

1. Go to Sales.
2. Select Products and services.
3. Click New, and choose Bundle.

To track your inventory, check out this article: Set up and track your inventory in QuickBooks Online.

Thank you for posting your concern here in QuickBooks Community. You can leave a reply in this post for further questions. God Bless