How to save associated records

Question

I want to save some related records I.e I have users into my system the users have the following fields (username,email,District,Tehsil,Uc,Villages) 
The Districts have Tehsils,The Tehsils have ucs and the ucs have villages Now i am using th while loop and its slow the saving process very much any one guide me for batter approach and share any liked similar work with me please