Move many devices into new group in one pass

Rerunning it will not create the devices in the right path. 

Massive delete is possible. Just delete the group. You'll be prompted with deleting the group only or the group and the hosts contained therein.

Will re-running the netscan csv import with the right path fix this or it won't import b/c device already exists?

330 devices...  ?

Is there a way to do a massive delete then? 

I'm not sure there is. However, you can drag and drop.