I make a visio with a dropdow, i had use the idx to set a baseline. But I want to show a nameo f a place instead of the id.

Here you see 65/ or 1/ or 2/ but i want for example: 65/ = Geel, 1/ = Kasterlee, 2/ = Hasselt,... So I want see only Geel, Kasterlee en Hasselt in the dropdown. And he must set "setvar id" when I selected for example Geel. He must set 65/.