Filter fields in a linked page

Hello everybody, first of all, thank you to all forum members, i have one month experience since im nav developer and im learning so much thanks to this forum.
I have a problem, i have a page showing the company locations and i have put a button that allows us to make transfers between locations.
when show the transfers page: how can i do to show the selected location in the field "transfer to code"? i would like that field be preloaded and dont be selected by the user.

Regards, and thank you so much.