A question on track recording

Hi guys,
 
I've got part of an audio track recorded that I like but I want to begin playing it and finish the audio around halfway through. Problem is, whenever I start recording the track won't play as it's recording and it seems to be either recording over or on top of what's already there. The only workaround I've found is to place the clip in a separate track so it'll play and then start recording at the desired point in the original track, if you get me. Anyone know a simpler way of doing this? Many thanks
 
 
 
 

Just realised the problem. I was in a take lane. I copied the clips up to the main track and it plays when I record. Thanks for your help buddy. I now know it's blend on blend mode I need.

Well, I usually insert a new audio track, select the input channel , enable the record feature n press record. Audio
playback of any already existing will play while the new one gets recorded.