Arbortext IsoDraw > User's Reference > Menus > Window Menu > Show Object Window > Commands in the Pop-up Menu > Selection to Active Contour Set
  
Selection to Active Contour Set
(3D mode only) Use this command to add the selected objects to the active contour set. The Selection to active contour set command is also available on the context menu when you right-click a selected object, and on the Contour Sets attribute window menu.
* 
You must make a contour set active before you can add objects to it. (See To Activate a Contour Set.)
For more information on contour sets, see About Contour Sets.
For command details and instructions, see To Add Objects to a Contour Set.