Sam,
one way is to use the “properties” dialog in the Library window, click the “Particles” tab and “Change Shape” tab, just select the Shape you want to copy and export it(the diskette shaped icon), repeat this for every shape you want to copy, then open up your “blank” library and load(the folder with a +) the exported shape(s).
a second way is to use the “Manage” function to copy an emitter that uses the “shape” you want to a blank library, then delete the emitter using the “properties” function.
John