ADD LINE

1. Select to pick a line by clicking its location.

2. Select to pick lines inside a rectangular window. The user can define the rectangle by selecting two points as its diagonal.

3. Select to pick lines inside a closed polygon. Each left mouse button click defines a vertex and a middle button click closes the polygon.

4. Select PART to pick lines included in the part.

1. Toggle the EXCLUDE light ON. The user can exclude the selected lines using the above functions.

2. Select REJECT and the user rejects the last selection.