Windows and skylights have separate fields so you will have to add in the skylight width and height.
This will create new columns in your schedules.
The widths for windows will be blank in the skylight width column, and the width for skylights will be blank in the windows column.
You will have to live with the 2 columns with blank values or create separate schedules, there is no way to combine them (unless you way to get into creating properties with expressions to create a common property in both the windows and skylights that can be used in the schedule instead).
Actually I just had a play and you can use the height and width fields in the GENERAL section rather than the widow and skylight fields.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11