It's not uncommon to want to group products differently on different channels. Sometimes by choice, and sometimes by requirement. For example, Amazon allows unlimited variations per listing, but Shopify allows a max of 100. Similarly, you may want all your products on the same listing on Amazon, but single listings on your webstore. Listing splits allows you to set up your listings this way. Note: currently, this functionality is limited to going from a larger Zentail group to smaller or individual webstore listings.
Creating a Split Listing
First, ensure you have the largest possible group in Zentail (example: pivoting by both size and color with all possible variants). Then open the product's side panel > scroll down to the webstore > click 'Advanced Options' > click 'Manage Listing'.
That will open a dialog like this:
If you were to list this product as is, it would create a listing using both size and color as the variation themes on Shopify. However, let's say you'd prefer to have each color as it's own listing that varies by size only. You would uncheck 'Is Pivot' for color. This keeps size as a pivot, but splits the different colors into their own listings:
Similarly, if you uncheck both then each size and color combo would be its own listing.
You can enter text in the 'Send As' field to use a value other than the attributes name. For instance, you could enter 'Shirt Size' to have that show as the drop-down option instead of 'Size'.