You can add a window to any kind of wall or add a skylight to an in-place roof.
To add a window to a curtain wall panel, you must first change the panel to a wall (see About Curtain Wall Panels).
Build panel
Mode panel
Load Family, navigate to the Windows folder, and open the desired family file. 
  
Tag panel
| If you want to… | then… | 
|---|---|
| change the orientation of the tag | select Horizontal or Vertical. | 
| load additional tags | click Tags (see Load a Tag or Symbol Style). | 
| include a leader line between the tag and the window | select Leader. | 
| change the default length of the leader | enter a value in the text box to the right of the Leader check box. | 
By default, the temporary dimensions indicate the distances from the window centerline to the centerlines of nearest perpendicular walls. To change these settings, see Temporary Dimension Settings.