problem copying audio clips

That is normal.... the one is hidden by the other but it's still there....

Play it to hear that it's still there. 

You can right click on a clip and display the clip properties for a number of handy features. 

Also, you can zoom in and split the clip very precisely so they DO butt up rather then hide part of one. 

If you set the audio SNAP TO GRID to musical time, you can split anywhere in the music, if you set snap time to MEASURE, you can split only on the measure lines. By using measure settings, your splits will be able to butt up with no overlap, and drums often lend themselves well to that setting.

I'm not on my DAW computer right now, but there is also a setting that allows 2 clips to exist overlapping each other.....and if that option is not selected.... "Blend old with New" it will be set to "Replace old with new" if I recall this correctly...... so pasting a new clip that overlaps an exisiting one would remove the old one. 

It's in the copy/paste settings window.  I think.   I recall having to set it to "Blend".............. I think this applies to over dub recording as well. 

These are things I don't mess with very often any more so the recall from memory is fuzzy. 

There are actually two settings.  One for recording, as Bobby pointed to, and one for copy/paste/drag.  

I'm currently looking at Music Creator 6... Here, the one for copy/paste is in the preferences dialog.  Make sure you're showing the advanced categories.  Near the bottom you'll find "Editing."  In Music Creator 5 it may be under OPTIONS|GLOBAL|EDITING (or something close to that).  Under "What to do with existing material" you can pick Blend old and new.  

You can also check a box to have Music Creator ask you what to do every time.

Wow, just realized I haven't posted here since Nov. 1! I need some guidance from The Bapu.
 
Yeah, the copy and paste and drag and drop options are 'replace old with new', 'slide over to make room' and 'blend new with old'. The last is what you'll use most of the time. You might also want to uncheck the 'link to original clip' box.
Once you've selected something, that choice will be the default so you won't have to check the boxes again unless you need to.