how to manage many list items in forms 6i?

[nadia]

Hi,
I've tried to manage four list items relateed to each other
the countries,states,cities,areas. when i change the value in the first list the second list should populated with values related to the first list and the third list should populated with values related to the second list and so on.
The proplem is when doing this the list values changed from text to numeric (the value which stored in DB).

any ideas?
Regards