I've never found a way to jump to different time periods in the recording directly. 

The only way I've found to make specific recorded sections is to:

1.) save (and save a recording too)

2.) quit

3.) reload that last save

4.) make a new recording (it will be recording from where your save picked back up)

5.) save the recording

6.) quit.  That newer recording is from when you loaded to when you quit again.  

Hopefully someone knows a better way for this, or better yet an answer to jumping in a recording