How do you change the starting point of a sequence?

[SomeUser]

I don't know how to describe it in the title so let me explain.
Whenever i wanna make a long song i have to listen to the entire thing just to see if i made a mistake in the part i'm making. How do you change it so you don't have to listen to the entire thing again and just the selected part?

[Kirbyderp]

Click on the measure bar where you want the new starting playback position to be.