The right-hand end of the Tool bar contains the Quick Preferences. These are Vectorworks and…
Vectorworks Tip #019 – Preferences – Offset Duplications
This preference is one of the Vectorworks preferences. To activate this preference, you have to open the Vectorworks Preferences from the Quick Preferences menu on the Tool bar. The preference stores the distance and angle of the offset when you use drag a copy. It then allows you to repeat the offset using the keyboard shortcut (command+D, or control+D).