Sketch Tool Guide

The sketching tools have several tool guides that allow you to change the behavior of the tool. These guides are active when appropriate:

Select Reference Curve	Use Select Reference Curve to dimension a sketch based on an existing curve.
Move Dimension Base Point	Use Move Dimension Base Point to move the base point from your starting point to a different location. This is useful when you want to control the distance between your new sketch and existing object.
Change Dimension Reference Angle	Use Change Dimension Reference Angle to dimension a sketch based on a reference angle from a point on an existing object.