Cloud Cart will create new products, if they are missing from QB. You can tell Cloud Cart to log error messages and you can map these products.
How do I set up this feature?
When you install Cloud Cart, the last wizard step says product matching. Under new product settings, choose flag order as error and map:
For existing accounts, go to the Cloud Cart configure page. Click the field mapping tab and scroll to the bottom.
How do I use this tool?
Sync some orders to QB where products are missing in QB. Hover over the gear in Cloud Cart. Click reports and product mapping. You will see a grid of products to map:
After I map the products, what happens?
Until you click resync, Cloud Cart will save no mappings. Once you are done, click create mappings and resync. Cloud Cart will create rules, which map SKUs and QB items. To see rules, hover over the gear and click rules engine.
Cloud Cart will resync the missing orders shortly.