I've created a master, and long timeline. It's several hours of material.
I used 'Save As', then chopped the project into smaller cuts of 6 to 12 minutes each.
When I export these shorter segments with both the self contained Quicktime movie, or the more time consuming 'Using Quicktime Conversion' options - the resulting Quicktime movies contain footage that I deleted from those respective timelines!
Grateful for all help.
W. Q.