Split a product into 2 different variants

The below use-case will help understand how it's possible to accomplish splitting a product into 2 different variants if it doesn't exist in the vendor's store.

Example
The vendor sells a bikini set but you as the marketplace want to sell the top and the bottom separately so the customer can choose a different size for the top and bottom

Considering the vendor doesn't have this option in his store and there is no SKU for the top and bottom separately, how can this be accomplished?

❗️This is not possible when syncing with the vendor's store.

Solution
- You would need to handle everything manually from the vendor portal (e.g. orders and inventory, etc.) and disconnect all the feeds associated with that vendor.
- Or, the vendor would need to create the separate items in his/her store.