Shopify Data Entry

I have a Shopify List with about 700 products in a csv file. There are 3 types of products. Stage 1, Stage 2, Stage 3. Each of these has one assigned picture. So each Stage 1 product, will have the same Stage 1 Picture, each Stage 2 product has the same stage 2 picture, each Stage 3 product has the same stage 3 picture.

I need someone to copy and paste these picture URL’s in the appropriate column. I already have the list with the products set up and the Image URL column setup.