Not sure I understand the question here.
Did you drag the clip into the sequence?
Your source audio is probably mono and your sequence tracks are stereo, or vice versa. You need a matching track for your source clip's audio to land in; you can either add one manually (right-click in the track headers and select Add Track and choose the audio track format that matches your source), or you can drag the clip to the sequence and a track will be created automatically.
If Colin is correct, see this ARTICLE on channel-count in PrPro. You may just have to scroll the Audio Tracks to sse your Audio Clip.
If this is not the issue, can you post a screen-cap, shoiwing us what problem you are being faced with?
Thanks, I changed the clips from mono to stereo and it worked. I am use to editing software (Avid mostly) that simply takes a mono track in on one track (L or R).
You can add additional Stereo or Mono tracks to your sequence when you start your project sequence setting ..or anytime later.
Save you changing the audio.
Ah, yes... I remember those days Came from Avid, myself, and I remember being a bit mystified about the whole mono track/stereo track business. Avid made sense with just a single track "flavor" to worry about... but now I'm used to the multiple track varieties and find it much more flexible. If you stick around, you'll get used to it too, and then you'll be broken like me