an object should track the custom field changes on a different object ????

Hello All, 
 I just need some help in implementing this by using validation rules ., there are five picklist values with  field names Master, Picklist A,Picklist B,Picklist C,Picklist D containing the values "Alpha", "Beta" and "Charlie" in all five ... 
if the Master field value is changed from "Alpha" to "Beta" ...picklist A and picklist B should be made mandatory..........
 
 
 

an object should track the custom field changes on a different object ????

Hello All, 
 I just need some help in implementing this by using validation rules ., there are five picklist values with  field names Master, Picklist A,Picklist B,Picklist C,Picklist D containing the values "Alpha", "Beta" and "Charlie" in all five ... 
if the Master field value is changed from "Alpha" to "Beta" ...picklist A and picklist B should be made mandatory..........