fieldcatalog in alv display

hi experts,

I have a problem in alv report. actually output table consists of 150 fields. out of which i want to display 15 fields in alv grid and rest of the fields get displayed only when user wants to by using change layout tab.. now for this i need to make field catalog for each field separately which will increase the no of code lines to a great extent which i dont want..

Is there any other alternative for that?

Thanks