Fitting Point of a Sketch

The position of a sketch can be parameterised if it is used in a Feature..

For this to happen, you need to add an isolated point as a fitting point to the sketch and then assign the point number "!" (exclamation mark) to it.

You can find the New point function at Sketch > New..., and the New point number function at Sketch > New > Point > ....

If you have assigned a point number, you can use the feature log to enter the new position of the fitting point.