Reduce song length - noobie help required

After using Garageband for years I am finding PT11 a bit complicated...



All I want to to do is trim about 40 minutes from the end of a song (left it running after recording??) With GB I just grabbed a little 'end' cursor and dragged it back to where I wanted it to stop but I have spent the last hour searching Google and can't find how to do it in PT.:mad:



Any help much appreciated.