These ISOs can be treated as if they are Windows Server 2008 R2 ISOs.
Simply copy them to the \_ISO\WINDOWS\SVR2K8R2 folder.
If you wish you can add a menu entry for them to the MAIN Menu (or any normal menu folder) by creating a .mnu file (use the RunVista.g4b example). You can find instructions for this here.
You could also create a new menu folder to add to the the Main Menu for multiple Multipoint Server source files (e.g. \_ISO\MULTIPOINT) by using the "\_ISO\docs\E2B Utilities\E2B SUBMENU Maker.cmd" script. Once you have created the folder, you can add in the .mnu file(s) as detailed above.