If you are using product attributes (Size/Color) in Prestashop each reference ID for the combinations of product must be filled in.
Step 1: Create unique SKUs for each combination in Prestashop.
The reference ID in this area should match your QuickBooks designation for that same product. Unify Desktop is able to see your products as matching in both the online store and in QuickBooks.
The matching criteria is setup in the store configuration->Product screen:
Step 2: Set your matching criteria in Unify Desktop
Step 3: Setting up Unify Desktop to recognize the Ref ID as the SKU
While in the configuration->Product screen area, select the Store Product Settings tab.
In the Overwrite store SKU settings field select "reference" from the list (as shown below):
Click Save & Continue to save these settings.
Step 4: How Unify Desktop sees your products
Once the combination reference IDs are added (in PrestaShop) and matching criteria is established (in Unify Desktop), the products will be structured as shown below:
Unify Desktop will download the combination SKU as individual items and the item will be the actual item SKU within an order.
Unify Desktop will be able to easily and properly sync any price or quantity fluctuation for product variations.