Additional PXE options from ISO's ( other than official from GSS)

Hello, 

Is there a possibillity to add some other PXE Boot Menu Options - not those one like offial ones - like WinPE 3.1, 5 or 10. 

I mean - I have some ISO (normally I am using it as USB pendrive) with GRUB2 and Syslinux and I would like to add it as an PXE option. 

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