If you open an elevation, activate the window tool and press CTRL+ A, you can select all the windows in that elevations or just select the ones you need manually. After that you can go to Document > Annotation > Label Selected elements to add a label to all of them in one go.
You can set up your label to include Element ID and other things you may want to add.
Alternatively: our reseller offers a custom label made specifically for this purpose with a lot of options for dimensioning, position of the label etc. You might have something similar in your library.
Erwin Edel, Project Lead, Leloup Architecten
www.leloup.nlArchiCAD 9-26NED FULL
Windows 10 Pro
Adobe Design Premium CS5