Disconnect
Disconnect Two Points
Use the Disconnect option to remove the line between two points, i.e. disconnect the points.
This option can also be accessed by selecting the Disconnect button from the Sequence toolbar. The Sequence toolbar is a "sub toolbar" and can either be accessed through the Modify toolbar or through using the Toolbar Visibility option (under the Tools menu).
Instructions
On the Design menu, point to Point Edit, and then click Disconnect.
Select the object that contains the segment(s) that you want to disconnect.
Select the line segment. The line is then deleted.
Select further line segments for deletion. Cancel when you have finished deleting segments.