Tip: Creating a Datum Point at the Extension of a Straight Edge or Curve
You can create a point on the invisible extension of a straight edge, straight curve, or datum axis.
1. Click
Model, click the arrow next to
Point, and click
Point. The
Datum Point dialog box opens.
2. In the graphics window, select a linear reference.
3. Under Offset references, select Reference.
4. Click the collector next to Reference, and then select a reference in the graphics window.
5. Drag the handle along the invisible extension of the selected edge, curve, or datum axis.
|  You can also adjust the placement dimension using the Datum Point dialog box. Click a dimension value listed in the Offset box, and type a new value. |
6. Click New Point to add more points, or click OK.