DzinEye's post in Terrain Wall Garden Bed Edge was marked as the answer
Don't think you can convert to any kind of wall, but you could Copy/Paste-in-Place the polyline, convert to plain polyline, then reconvert to a molding polyline and give that molding properties that would mimic a garden wall (size, shape, materials).
DzinEye's post in Stair Section Winders was marked as the answer
Use the 'complete break' tool/ability
DzinEye's post in Problem Moving Dimensions to Cross Section Lines was marked as the answer
Long-standing issue getting snaps to objects in elevation and section.
Use Cad Detail from view... do your Point to point dimension there, then cut and paste it into your section... Or just use the cad detail if you don't need a live section