Ok to bad you didn't say that earlier. :Load the clips into Session drummer and you'll be rockin. Your doing it the hard way. 

Session Drummer is a sample player, Sonar is a recorder. Using a sample player makes a lot more sense right? 

Take your clips and copy them to the Session Drummer folder where the Flac and SFX files are. On XP this is the location.

 C:\Program Files\Cakewalk\Vstplugins\Session Drummer 3\Contents\Kits 

You could make your own folder so as to not mix things up--   13- Funkys loops 

Open session drummer and browse each sound to assign to each part of the kit. I did this with my own samples of my accoustic drum kit. It's spooky to hear your own drum kit played by a drum machine. 

thank you, but I am just experimenting, I want to see how it works this way
it is indeed the hard way I must admit

It's spooky to hear your own drum kit played by a drum machine.

 
But then, that's exactly what it's all about!