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?
Your collection file should stay in your Traktor Folder. Of course having a back up on your external drive is a good idea.
After you have moved your tracks, you just need to go into preferences and tell Traktor where to find them by changing the file path. No need for a new collection.
Importing a new collection, if I remember right, would be a entirely new or different collection. Not merged, and not as a separate tree.