Automated Assigning Pictures to Retail products

Hello- I have a site for a retail location. I upload my products with variations into woo commerce and then upload all of the pictures. I am currently having to go through each product and assign the pictures to the products. Is there a plugin to make this process automated? I would like to upload the products and their variations and the pictures all at once. Right now it is so time consuming that I can never actually get it done before the next line comes out. Please let me know what everyone is using.
Michele