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Install the other OS (leave the MBR unmodified when you're asked). Then boot back into Fedora and merely re-install grub2. It will automatically find any other OSes and add them to the list.

sudo grub2-install /dev/sda

Replace "sda" with the disk you want to install the bootloader in.

In case the other OS doesn't give you the option to leave the MBR untouched, it will probably detect Fedora itself and let you boot into it. Once logged into Fedora, reinstall grub2