In order for eCC Desktop to integrate smoothly with Shopify product variations, each variation must have a unique SKU.
How eCC Desktop sees the products
This unique variation SKU is the actual SKU that is chosen by the customer and downloaded into eCC Desktop within the order.
When the order is posted to QuickBooks, the SKU in Shopify should match how the product is expressed in QuickBooks. The transaction is created in QuickBooks and all the product and customer information is transferred to QuickBooks.
Within the Product module, eCC Desktop will on detect the unique variation SKUs.
Price or quantity of the variation can be synched between Shopify and QuickBooks and inventory can be managed.