Ableton Forum

Anybody else using the session drums pack that Ableton sells? I want to use the kits that have the combined samples that represent the range of velocities ( loudness of hits) It comes as a single aif file with each sample represented by a 'range' in the zones ( using sampler). So each aif file may have 10 to 40 different hits. Question is this.. How do you change out one of the drum sounds with a sample from another drum kit and still get the zones representing the range of velocities? What ever I try to do - i.e drag an aif file form the samples folder I just get one file in the zones - not a selection of ranges representing all the hits. It makes no sense at all - as clearly that particular file does whats its meant to in the adg file that uses that particular type of drum sound.
Now I know that I can keep duplicating that file and some how using the handles in sampler to select only the hit I want - but again that is almost impossible as sampler ( for some reason) cant be enlarged.
Im sure this seems like Im missing something basic here - some appreciate some advice on the what the hell Im missing.
Cheers