Search Help for 0customer

Hello Experts,

I need some guidance with having a search help capability in Bex Query Designer. So I want to do is have say 0Customer as mandatory variable and show country,city,state that are attributes of 0customer master data to be in search help in selection screen.

So user can press F4 and see customer ID, country,city,state and has ability to search on any of these.

How is this possible? any ideas will help.