Fedora 20

Multi-boot Manual Bootloader

Fedora 20 does not offer an option to install the bootloader to a partition. This is the workaround:

1. Begin Fedora installation as usual.
2. Enter the Installation Destination spoke.
3. Click on Full disk summary and bootloader… at the bottom left
4. Select the disk with a check and click Do not install bootloader
5. Click Close, and proceed with installation as desired
6. When installation is complete and Fedora tells you to reboot, don’t! Instead hit ctrl-alt-f2, and run the following commands:

chroot /mnt/sysimage
echo "GRUB_DISABLE_OS_PROBER=true" >> /etc/default/grub
grub2-install --no-floppy --force /dev/sda1
grub2-mkconfig -o /boot/grub2/grub.cfg

Optional, add other boot chainloaders to /etc/grub.d/40_custom

menuentry "Fedora (chainload)" {
    insmod ext2
    insmod chain
    set root=(hd0,msdos1)
    chainloader +1
}

Source: How to do manual multi-boot configuration with Fedora - https://www.happyassassin.net/2014/01/08/how-to-do-manual-multi-boot-configuration-with-fedora/