This article describes the SKU-level control of Product and Image Data for products listed to BigCommerce or Shopify. (If you haven't yet, you should take a look at the Integration instructions for either Shopify or BigCommerce.)
Normally, the sending of product data is controlled on your Integration Settings page:
However, it is also possible to override this per-SKU. Edit the SKU, then click Advanced Settings on your Shopify or Bigcommerce integration cards:
You should see the three radio buttons below for both Images and Product data:
By default, all SKUs are set to Inherit, which will inherit the settings from the Integration page.
Send will override the Integrations page and send Image or Product Data over to shopify for just this SKU.
Don't Send will not send the Image or Product data, again regardless of the current setting on your integrations page.