What version of Premiere Elements, and what computer operating system?
How are you applying the pan and zoom effect - Pan and Zoom Tool, Effects presets for Pan or Zoom, or Keyframing of Scale (for Zoom) and Position (for Pan)? And to what are you applying it to - video or still?
What are you asking - concept like keyframing pan and zoom across the duration of a given clip or something else?
Please give more information so that we can customize an reply for what you seek.