Step 1: Edit the product details fo the chosen product.
Step 2: Go to step 2. for Colors and Sizes, select Add colors
Step 3: You can mass select main Color and Trim Color.
Step 4: Your selections have been applied.
Step 5: Make your size selections.
Step 6: Make your size selections.
Step 7: Go to the pricing tab and select the Add Color/Size variation button.
Step 8: Your previous selections are shown and are now able to have pricing.