Mapping geological contacts often needs true contact and inferred contact. I would like to know if it is possible to divide a single polygon outline which marks the outline of a granite body, so that it can be inferred contacts (dashed lines) and true contacts (solid lines)? Basically can different borders of a single polygon be edited separately? I am using ArcMap 9.3
If I understand you correctly, not in any GIS package I'm aware of. The general procedure here would be to use two polygons and symbolize them separately. That said, it is possible to edit edges of a single polygon separately - that is, move, add, delete vertices, etc. - but symbolize then differently, not as far as I know.