Solved How to remove part of audio track and replace it with another in Vegas Movie Studio

Hello Everyone, 
I am new here and was wondering if someone could help me with the following:
I would like to replace part of the audio track with another one while leaving the video part the same. Weird things are happening when I try to do this, so this is why I am asking. 
Thank you in advance.

Hello AgnesF

What weird things are happening ?

There are a couple of things I can think of.
1. Make sure the Auto-Ripple Tool is turned OFF.
Location of Auto-Ripple is shown in screen shot below.

 

2. To remove Audio attached to a Video, you will need to Un-Group both files.
Click on Audio or Video file, then press U for Un-Group - files will now move independently and can be edited separately.
To Re-Group an Audio and Video file, select both (yellow border will appear), then press G for Group.

3. After you have Un-Grouped an Audio and Video file, you must first select either the Audio file or Video file, before you attempt to Edit / Cut that file into pieces.

Example:
a) Un-Group the Audio from a Video file
b) Press on Audio file  - yellow border will appear.
c) Select part you want to Cut and press S for Split
d) Move along and find end of section you want to cut and press S for Split.
e) Now you can Delete the section you don't want

Alternate ways to Edit Audio, without having to Cut/Delete audio files
I have an old tutorial I recommend you watch.
In this tutorial, I show how to Edit Audio Volume over time using an Audio Envelope.
www.moviestudiozen.com/free-tutorials/sony-movie-studio-platinum/61-how-to-edit-audio-volume-a-pan-envelopes-using-sony-vegas-movie-studio-hd-platinum-10

Regards
Derek
 

Hello
Thank You very much for the explanation. I studied carefully Your third part of Vegas Movie Studio beginners' guide and I know what happened. I was selecting the part to be deleted exactly on the line where the time line is divided, whilst You said it should have been the black part of the timeline. I was then dragging the part of the film from the beginning of the deleted part to "fill in" the gap which was there, as a result nothing was deleted. 
Could You please tell me if I have to "fill" this gap in the audio with something to make everything click together on timeline? I don't need any audio in that part at all but not sure if I can leave this gap empty on the audio track.
Kind regards
Agnieszka

It's perfectly OK to leave gaps on Audio Tracks.

Thank You very much.
Everything worked fine now. Bearing in mind that it is 4:23am here now I think I am managing well.