Test part of the timeline?

I’m working on a really long animation…say 5 minutes long. Now, I’m editing some of the animation at around the 4 minute mark. As a result, whenever I want to test the part of the animation I’m currently working on I have to wait for the whole first portion of the movie to play before I can see what I want to see…

Is there a way in flash, rather than previewing the entire timeline, I can specify a “work area” so I can test only the part of the timeline I’m currently working on? Thanks in advance!