Hi,
i boot all my iso’s that way:
initrd http://${fog-ip}/iso/acronis2017.iso
chain memdisk iso raw ||
goto MENU
:easeuspms
initrd http://${fog-ip}/iso/easeuspms.iso
chain memdisk iso raw ||
goto MENU
:aomeipau
initrd http://${fog-ip}/iso/aomeipau.iso
chain memdisk iso raw ||
goto MENU
:veeam
initrd http://${fog-ip}/iso/veeam.iso
chain memdisk iso raw ||
goto MENU
:erd2005
initrd http://${fog-ip}/iso/erd2005.iso
chain memdisk iso raw ||
goto MENU
:dart7
initrd http://${fog-ip}/iso/dart7.iso
chain memdisk iso raw ||
goto MENU
:dart8
initrd http://${fog-ip}/iso/dart8.iso
chain memdisk iso raw ||
goto MENU
:dart81
initrd http://${fog-ip}/iso/dart81.iso
chain memdisk iso raw ||
goto MENU
:dart10
initrd http://${fog-ip}/iso/dart10.iso
chain memdisk iso raw ||
goto MENU
:dban
initrd http://${fog-ip}/iso/dban_2.3.0.iso
chain memdisk iso raw ||
goto MENU
Here is my complete menu: https://pastebin.com/zWBnT5c0





Thank you Tom for giving the solving idea