Thanks for coming here today, eliasdehmes.

In QuickBooks Online (QBO), you're only able to add one SKU when adding an inventory item. This is to secure an accurate information when tracking your inventories.

Learn more about managing SKU's in QBO through this article: Add inventory products in QuickBooks Online.

While we continue to make your experience with us even better, I encourage you to visit our QuickBooks Blog to be updated with the recent developments made in QBO.

Let me know if you have any follow-ups or other questions. I'm always here to help. Wishing you a good one.