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 clicking Disconnect
from the Sequence toolbar. The Sequence toolbar is a "sub toolbar" and can either be accessed through the Modify toolbar or through using the Tools > Toolbar Visibility option.
Instructions
On the Model menu, point to Contouring, 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.
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