Step 1 : Go to the File Menu and select the Configure Store option.
Step 2 : On the Configure Store screen, go to the Products tab and place a checkmark on the "Create product variants using Styles in Point of Sale" option (unless already checked). Then then select field from the drop-down which can be used for the SKU while creating Parent product in online store.
Click on Save & Continue and then on close.
Step 3 : Now on the Dashboard, go to the Products menu and select the Transfer Products option.
Step 4 : Go to Transfer to Online Store tab and click on Get Products button to download the latest products from POS and the Online Store.
Step 5 : Make required settings and choose a category. Then click on the Map Attributes button.
Step 6 : Enter the attributes for the selected product and click Save. Hit Ok on the next popup.
Step 7 : Click on Save. As soon as you click on save, the status of the selected orders will change to "Ready to transfer" .
Step 8 : Now click on the Transfer Product(s) button to send the product from POS to Shopify.