Autodesk CIVIL3D - CIVILDESIGNCOMP 2007 SLM CD Tutorials Manual page 389

The back lot line now has a point of intersection at the point at which
the parcels meet. With a PI in this location, you can edit the lot line on
one of the parcels without affecting the other.
Grip edit a parcel lot line
1 In the drawing, select the lot line that separates parcel 104 and 105.
Notice the grip on the lot line. This grip is available on attached lot
lines, which are created with the slide angle, slide direction, and swing
line precise sizing tools available on the Parcel Layout Tools toolbar. You
can use this grip to slide the lot line along the lot line to which it is
attached.
2 Press Esc to deselect the lot line.
3 Select the back lot line that is shared by parcels 105 and 106.
Notice the grips on the ends of the lot line. These grips are available
on lot lines that were created either from other AutoCAD Civil 3D objects
or the fixed line and curve tools available on the Parcel Layout Tools
toolbar. You can use these grips to change the endpoint location of a lot
line.
4 Click the grip at the top of the lot line. Drag the grip toward the lot line
that separates parcels 104 and 105. Snap to the intersection of the three
lot lines. Click to place the grip.
Exercise 3: Editing Parcel Lot Line Geometry | 377