When I want to "audition" my shot work, to choose and discard, firstly I use the device control and enable the scene detect option and secondly go on to then audition the clips within Media Manager.

From within MM I can then collect and collate into Tag folders. I don't use subclips as a way to create a body of good clips, I use Media Manager.

Previously, prior to MM, I would audition the clips and create folders and subfolders within Project Media.

When You say "Say, i have a 10 minute video file wich contains about 30 clips." I am assuming that you used the auto scene detect? So yes, Vegas does/is timecode aware to do this job, if what you say you have is 30 clips? If you actually turned ON and the OFF the camera to create separate "clips" then Vegas will sense the timecode and create 30 separate clips. No need to create subclips for this purpose at all. But re-reading your post it would appear you have captured a 10 minute file WITHOUT using auto scene detect. This leads me onto thinking that you actually either didn;t shoot/capture by pressing the camera on and off and/or you haven't engaged auto scene detect. So, which is it?

If you DID press the on/off button on your camera, I would recapture using AUTO scene detect.

If you can't or don't fancy doing this "easy" solution then another way is to go through your 10 minute file and create "Regions". Read the online help about regions.

Grazie