Reply to Importing another collection

My setup is Traktor Pro 2.5.1, OSX 10.6.8

The internal disc i full - 500 gb.

Manually I have copied musicfiles to external firewire disc. Also copied the Native Instruments mapp in documents.
(did not use the function export collection since its not working properly when copying 500 gb)

Whats happening when I use the "Import another collection"?

Will the "other collection" show up as a tree structure on its own in the browser tree in Traktor Pro?


(or will it mix with the old tree-structure?)

Mixt