select-option : variant

HI,

I have a select query like :

select a b c d from db table into internal table

where

zbranch in c0, c1, c2, c3...so on.

where c0, c1, c2, c3 are constants.

My question is : how to store these constants in select-option and to create a variant for that.

I can use constants however I would like to keep in select option by creating a variant for maintanance purpose so that I can change them whenever required.

Regards,

Aakash