Noob Question: Drop-down Menu
 

I'm trying to make a Vanity which has a drop-down menu with three options. Depending on the option chosen the character gets a particular magic item add to his equipment. How can I make this happen?
https://i.imgur.com/CS4l1om.png

Thank you in advance for your help and time.

There isn't a way to make an auto-added item conditional, so I think this would probably normally be implemented by creating three separate versions of the original thing that each add a different one of the options, and then the user has to choose between them.

For example,

Initiate's Edge (Elixir) that auto-adds just the Elixir of renewal
Initiate's Edge (Tattoo) that auto-adds just the Tattoo of the open road
and Initiate's Edge (Wand) that auto-adds just the Restorative Wand