UPDATE:
I solved it by creating an input and fetching the Cities from the other table. The tutorial on how to do it is here: Set options in a select list from backendless database in case someone else needs a bit of help with this one 
Thanks!
UPDATE:
I solved it by creating an input and fetching the Cities from the other table. The tutorial on how to do it is here: Set options in a select list from backendless database in case someone else needs a bit of help with this one 
Thanks!