Selection Screen Button for Variant selection for ALV output

HI Gurus,

I have a scenario like:

I have created a selection screen, where in I need to have a BUTTON - when user clicks on this button - all the variants associated with the selection screen output ( output is an ALV list containing say 30 columns) - By selecting the appropriate variant user can filter the output.

I am using function module - LT_VARIANTS_READ_FROM_LTDX to get the list variants.

Please guide me on the exact steps to be followed.

Many Thanks,

Madan