Coincidence Constraint

Two lines are coincident, if the position of the lines is on the same line. Two points are coincident, if the points are located in the same point.

1. Select Drafting | Constraints | Coincident.
2. Select a line or a point (A).
3. Select the second element: a line or a point (B). The elements will be made coincident.

Select line elements, and then select the Constraints > Coincident from the context-sensitive menu.