http://creatingsound.com/2012/08/saving-space-with-linear-audio-in-pro-tools-part-2/

In Part 1 of this tutorial, I covered the process for getting started, staying organized, and identifying and removing silent gaps. For Part 2, I go through more space-saving tips by demonstrating how I look for opportunities to reuse the same audio clips in multiple places. If this part is not an option for your project, look for Part 3, PREPARING THE SESSION DATA, coming August 23rd.