Copy

Scales and copies the elements in the selection set.

Step

Specifies the step value for the Scale Factor. The step value causes the Scale Factor to be decreased or increased in increments as you move the pointer toward or away from the scale origin. For example, if you set the step value to 0.25, the scale increases in increments of 0.25 as you move the pointer away from the scale origin.

Scale Factor

Specifies how much the software reduces or enlarges the element. A scale factor between zero and one reduces; a scale factor greater than one enlarges.

Reference

Specifies how long the dynamic line from the scale origin to the pointer has to be in order to achieve a Scale Factor of 1.

For example, if you set Reference to 1, for every inch you move the pointer away from the scale origin, the scale factor increases by one. If you set Reference to 2, for every two inches you move the pointer away from the scale origin, the scale factor increases by one.