Session Drummer 2 Problem With Copying

I have SD2 loaded in Sonar LE 8.5.  I am trying to take one of the pre-fab loops out of SD2 and modify it.  For example, in SD2 I open the hard-rock tight program and pick the A clip.  I drag it into the midi track.  Great I have a measure of drums.  Then I drag the clip across 16 measures.  Perfect.  But what I want to do is edit it to make it my own.  So I open the piano roll by double clicking on the midi clip.  Fine.  So I delete events here, and add events there.  Perfect.  Then I realize that I want two measures at the beginning.  So I slide the whole 16 measures two the right 2 measures.  Then I copy the final two measures of the drum clip and paste them at the beginning.  But instead of pasting in the final two measures of the clip at the front, it pastes the first 2 measures.  Its like when I edit part of a pre-fab clip it wants to apply those changes to everything I copied.  I have read in some other forums that there is an unlink option but I can't find it anywhere.  

I just want to start with a SD2 prefab and create my own from there.  Help if you would.