There are 2 kinds of door and windows:
1. Simple door/windows that appear in the
Window catalogue. These are .cyg object files and can be edited as normal .cyg objects. However to identify these objects as windows that create openings and snap into walls, you must use the Chunk Editor to identify the object as a window.
See video
for this window type.
2. The more complex windows appear in the Window Construction catalogue. These are in fact macros created with the Window Construction tool (available in Visual Building Premium and higher). Windows Construction macros allow you to modify all the sizes defined within the window macro without the tool, but you would need the tool to create new windows.
See video
for this window type.
There is a tutorial showing you how to add a lintel to a window and save it to the catalogue for future use:
Windows and Lintels
