Right click on the clip, select Audio Gain and select "Normalize" option.. Is this what you are looking for?
The main thing I want is to make sure that audio level is too high for one footage and then too low on the other. At the end, all the clips are put together to produce a single video and I want the audio to be consistent throughout the video.
Would I then select all the clips and do what you're suggesting? Do I do this one clip at a time or do I select all at once -- not sure how to do it?
Yes, Normalize will do this to a certain extent, but must be applied to one clip at a time.
As always, though, as I say in my books, there's a limit to what can be done automatically. And you're much better off opening the Audio Mixer (under the Window drop-down menu) and using it to monitor your audio level as you set it, one yellow horizontal line at a time.