Create a file with the window managers name in /etc/X11/gdm/Sessions with the following lines
#!/bin/bash
exec /etc/X11/xdm/Xsession window_manager
For example, to add icewm:
vim /etc/X11/gdm/Sessions/IceWM
and put in it:
#!/bin/bash
exec /etc/X11/xdm/Xsession icewm
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