I have a suggestion, as described in the title, to allow custom portals to teleport players to a specific portal and back to the portal where they came from.

Example: there's a commercial world I'd like players to be able to access if they use a portal frame made of gold blocks. However, I'd like them to spawn where the commercial buildings (specific XYZ) are located at (a commercial town) which is where players make stores./transactions.

Thanks in advance!