Thanks for coming back, sychan.
When connecting Shopify to QuickBooks Online (QBO), the process is done in the app's side. With that said, it would be best to contact the app provider to check on which field you'll need to use either "NAME" or "SKU" to sync with Shopify product master.
Any concerns about syncing or integrating the third-party software into your account are best handled by their technical support. If you already connected Shopify in QBO, here's how to reach them:
On the other hand, the Name and SKU fields are both available in QBO when adding your inventory products. You can check out this article for more details: Add inventory products in QuickBooks Online. Then. go to Step 2: Add your product’s name, SKU, and category section.
Visit our Helpful Articles page for more insights about managing your business in QBO.
This will take you in the right direction today, but please don't hesitate to get back to me if you have any follow-up concerns. I'm always here to help. You have a good one.