I have a form with two filters Area and Zone

Customer name group product area zone
xyz x1 p1 A a
abc x2 p2 A b
mno x1 p1 A c
opq x3 p3 B d
qrs x4 p4 B e
tre x5 p6 B f

Hi All , 

I have two filters Suppose Area and Zone to filter the data Area and zone have different values both filters are drop dow

Ex - if we will select the Area value A  then in Zone  filter will show only Option a , b , c instead of a , b , c ,d ,e ,f  and if we initiate with filter F2 Value e then it should show only option B instead of A , B.... i cant understand the logic 

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