1. In Sku Grid, go to Import/Export --> Import From Marketplace --> Click the button to import your items from the marketplace that you list on.
2. New items that are imported will be paused, allowing you time to edit the supplier urls and unpause them.
3. Next, click on Import/Export, click on Export CSV.  Proceed to download your CSV file.
4. Do NOT use Microsoft Excel as it changes your ebay item numbers. It is preferred for you to open your CSV in Google Sheets or Libre Office -- both of which are free.
5. Edit your supplier urls in the vendor_url column.  Add the variation in the vendor_variant column (if applicable, otherwise leave it blank)
6. Change reprice_pause to 0 (this will unpause any paused items)
7. All of your other information was already pre-filled.
8. Do a File --> Save As --> to save this as a new CSV on your computer (be sure the file type is CSV)
9. Go to Sku Grid and click on Advanced --> Purge All Items.  This will Delete ALL of your items from Sku Grid
10. Click on Import/Export and choose Import From CSV.  Browse for your newly saved CSV and Upload the document.
11. Your items from the CSV will be imported into Sku Grid.  It will take some time for the upload to finish and for all items to update.