How do I click and drag an edge of a mask without dragging the rest of the mask with it?

[Todd Kopriva]

See this part of After Effects Help:
https://helpx.adobe.com/after-effects/using/animating-shape-paths-masks.html#select_masks_segments_and_vertices

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Todd Kopriva, Adobe Systems Incorporated
After Effects quality engineering
After Effects team blog
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[John Cuevas]

And if you don’t want to read all of that, twirl open your mask and click on path, then use selection tool(the arrow) draw a rectangle around the areas you want to select. Then move them.

Johnny Cuevas, Editor
Thinkck.com

“I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work.”
—THOMAS EDISON on inventing the light bulb.

[Darragh Griffin]

Johnny, thanks a lot for your advice. Works a charm!