In an open sketch, hold down Ctrl and select two sketch entities.
Click Point
on the Sketch toolbar, or click Tools,
Sketch Entities, Point.
A virtual sharp appears at the point where the sketch entities would intersect.
A virtual sharp creates a sketch point at the virtual intersection point of two sketch entities. Dimensions and relations to the virtual intersection point are retained even if the actual intersection no longer exists, such as when a corner is removed by a fillet or chamfer.
To create a virtual sharp:
In an open sketch, hold down Ctrl and select two sketch entities.
Click Point
on the Sketch toolbar, or click Tools,
Sketch Entities, Point.
A virtual sharp appears at the point where the sketch entities would intersect.
Set the virtual sharp display style in Tools,
Options, Document Properties, Virtual Sharps.