Arbortext IsoDraw > User's Reference > Menus > Window Menu > Show Attribute Window > Editing Halos > Selecting Halos
  
Selecting Halos
 
You can select a halo by clicking the name of a halo in the Halos window. In the Halos window, the current halo is indicated by a highlighted background.
Your selection has two effects:
it changes selected elements
 
it changes the selected halo into the current halo
This allows you to change existing elements. Select the elements you want to assign a different halo to. Then select the required halo.
The current halo, on the other hand, functions as a preference for those elements you still have to draw.