This is how I would do it...
Create a new .mnu, say, CABToolBar.MNU. Put only the following lines:
Menugroup=CABToolbar
***TOOLBARS
Then, in AutoCAD, load that .MNU file. Then add new toolbars in the CABToolbar menugroup, and drag all existing buttons to new toolbars while holding CTRL (to make copies, not move them). Once finished, you'll have duplicate toolbars in your new CABToolbar.MNS. Then copy and paste those back to the CABToolbar.MNU, then you own them!
EDIT: You'll need to make minor changes to the .MNU, possibly bitmaps and controls, but that's about it.
ALL of my toolbars are in my own seperate .MNU file, that way, when I reload the ACAD.MNU, I won't lose anyt customization.