Shopify backend uses Collections to categorize products, in SoldEazy, we call it "Store Categories", you can use it just like how you use eBay shop categories.

Go to Sell>Store Category, go to your Shopify store, then click "Edit" button.

Then a small window will pop up and show current existing categories.

Click "Create level-one category" to add a new category.

If you modified Collections on Shopify backend, then please go to SoldEazy's store category page, and click "Sync back" to synchronize back your updated categories.

Go to Shopify datasheets, click pencil button to edit, and choose the categories that you want to use in "Shop Cat" and "Shop Cat2".