Dear Jake,
you can use the topological editing. In Settings/Snap options dialog
enable topological editing, check Avoid Intersections for the editing
layer and optionally set a tolerance for snapping.
After it you have to draw only the missing part of the a new polygons.
Regards,
Zoltan
On T
I want to create a new polygon and in one area it should follow the segments
of another polygon .
(I have a forest and want to delineate the stands.) Which plug-in can I use
to tell the program that from here to there it should just follow an
existing polygon either in the same shapefile (stands)