merge two sound tracks ?

Hi, i'm working on DR17 and have two audio clips from the same lecture succeeding in time (for some reason the recording stoped and continued as as different one) that i synced with the videorecording (having its own audio track) based on waveform. Each of these two audio clips is on its own audio track.
In order to facilitate editing, is there a way to easily merge the two succeeding audio tracks together into a single one (basically matching what f.ex. Redgiant Pluraleyes would do) ?