how to start recording in the middle of a song?

Hi guys, I want to start another recording track in the middle of a song ( ie not a time zero). Sometimes I manage to do this haphazardly but I always fail to recognise just how I did it.
Ive checked the online doc but failed to find it nor in the faq.
Can someone please shed some light on this?

Just click your cursor in the existing track at the required start position anf d then click the Record bitton - recording should start on a new track at your cursor position.

BTW - you can always move tracks around later with ethe Time-Shift tool.