Adding file(or folder) to iTunes library

I have Limewire Pro. When I try to add the content of the shared folder (folder where I download my files) to iTunes, the files in that folder are copied to iTunes but remain in the original or shared folder of Limewire. So, apparently they are duplicated: two files
(one in LimeWire and one in iTunes with different paths).

I also have Limewire free version on another computer and when I do the same operation described above, the original files disappear from my original shared folder of Limewire.


What should I do so that in my Pro Version of Limewire the original files disappear like in my free version, when I add the file (or folder) to my iTunes library? I don't want to have duplicate files.
I just want to transfer my downloaded files from LimeWire to iTunes.

Any tips??

-->THANKS<--