how to get values into internal table dynamically after uploading the file

hi folks

i have a requirement i.e. once i upload the file using the method gui_upload we generally use split command and send the values in to internal table fields.

example : SPLIT it_itab AT c_semicolon INTO

it_itab-matnr

it_itab-werks

it_itab-stlan

it_itab-stlal

but here i must not give those fields rather it must be sent dynamically.

so can someone let me know how i can work on this.

thanks in advance