I created a script including a custom window appearing with 3 "gfield" to fill: I'd like to be able to choose a value from a list (to use specific words) when I fill one of these fields: is that possible?
If I'm reading this correctly, you're trying to use a value list for an input field in a Show Custom Dialog script step. I'm not aware this is possible. You list possible options and loop back if the user didn't enter a valid value, but it would certainly work if you just create your own small window with the fields and controls (including value lists) and present that to the user instead.
Retrieving data ...