Comment 2 for bug 1568050

There is a "--bootloader-id=" argument to grub-install that lets you choose a different name and only remove other entries with that new name. So, if you're careful, you can choose unique names for each and get other entries.

It's wrong and weird to remove anything by running "install" though. It might even be okay to make the most recently "grub-install"ed device the first, preferred device in the boot order, but it's not okay to remove others.