I imported audio files recorded in poly bwf, 4 tracks,
what i need now is to manage them indipedently one by one, i can see them i inspector, ma cannot to import and have them separated in time line.
any helps?

SD's 'Wave Agent' can transcode a multi-trk poly file into separate mono files.. among other useful BWF features.
Download Wave Agent 1.16 | Sound Devices, LLC (http://www.sounddevices.com/download/waveagent.html)
Did I mention it's freeware? Available for Mac & PC.

This may be useful info as well:
How Final Cut and Avid Import BWF Time Code Metadata|Sound Notes|Sound Devices, LLC (http://www.sounddevices.com/notes/recorders/time-code/importing-to-fcp-and-avid/)