Changing what metadata get saved?

is there any way to changing what metadata get saved (or tell me where the file that chooses that is)? i have tried a lot of time and no matter what i can not get grouping to save, and a lot of the metadata that is imported is useless to me, but i need label (it is very important). it would be nice to choose what metadata was listed/imported (like other programs) rather than re-doing huge databases.