As a buyer, you can split a pool purchase between multiple entities. You can do this on an asset level, and the Assignments and Allonges will reflect those choices.

In the "Buyer provided vesting information," add a vesting profile for the asset(s) you want to purchase with one of the entities.

Click "Save Vesting Information" and then proceed to the same process for the other assets with the other vesting profile.

After completing the above steps, click the "Save Vesting Information" button. Your chosen information for vesting profiles will be shown on the Metadata tab.