How to create linked list


i am new in Commcare and i use demo account, i need to form a list includes
some Provinces , when i select one of province ,another list box will list
district related the province, following i will list subdistrict related
the selected district.

I found lookup table but i cant use it because it is for standart
account or over account users. how can i perform this apart from lookup

Thank you in advance…