Apply and edit a dimensional constraint to control the size and proportions of a sketch. You can make a dimension
"driven" so that it's a regular dimension, not a constraint.
Click one of the default sketch planes: Top,
Front, or Right.
Click the planar face of an object.
Click a curve.
Choose from Sliding, Centered, or
Centered and Aligned.
Right-click and mouse through the check mark to exit, or double-right-click.
Tip: To detach the sketch from the face of an object,
right-click the sketch, select Change sketch plane, then
select Unlink Face in the guide bar. Now, changes to the
object won't affect the sketch.