help with exporting segments of video footage

I have 20 minutes of video footage.  I am inserting segments (5) of that into a Powerpoint presentation.  

My current workflow is as follows:

• i already have the footage split into segments.
• I then save the file 5 times, called segment 1, segment 2 etc
• I then go into each copy and delete the segments not required
• i then export these files to MP3 or MPEG4
• and insert them into the Powerpoint

I feel like this workflow is clunky.

any  suggestions?

Thanks

Helen