UEFI - how to install Fedora twice on same disk? (without breaking boot)

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http://forums.fedoraforum.org – Hi. What is the proper way of installing Fedora twice on a UEFI disk. I tried but whas not able to access the old install... i.e can 2 Fedora installs share UEFI/EFI partition ? I access UEFI from the computer's BIOS when I install Fedora it gives me as 'Fedora entry' from the bios UEFI boot selector - however if install a 2nd Fedora that takes its place (i can;t access old version) Can anyone assist. I think that UEFI is one of the worst things I have tried to work with... (HowTos)