I have form which has five field like below 

TV Station Form :

TV Station 

Not -01 -- -- (lookup field from Network form)

Not -02 --  -- (lookup field from Network form)

Not -03 -  -- (lookup field from Network form)

Not -04 -- -- (lookup field from Network form)

Screenshot of  TV Station Form view ;

What I am trying to do is to fetch all  respective values from the fields --Not-01, N ot-02, N ot-03, N ot-04 to a picklist Network of below form when user select any station name.

Say User Select TV station name is KBEH-TV from Drop down then a script will fetch all related values for instance here should be 

Me-TV ,   

This TV

ABC

CBS

and if user select WRNN-TV then in the network field should populated only the corresponding values of Not- 01, 02,03, 04 fields .it should be 

NBC

Me-TV 

Bounce

DGR

Final Form screenshot:

Can any one please help me how to do that ?

Thanks 

Arfater