Some users may not see the "Fit Walls to Objects" command in the default Landmark workspace in Vectorworks 2014, which in that release, allows users to use that command to fit walls to site models directly.
The corrected workspace can be found attached to the bottom of this article. Or, if you wish to modify your own custom workspace, it can be added via the Workspace Editor. The command can be found under Menus > All Menus.
Edited by JimW