Installing OSX Lion on OSX Mountain Lion Partitioned drive-Help/Advice please

I have my late 2009 27" iMac running OSX 10.8.5 Mountain Lion but need to install OSX Lion on a separate partition and would appreciate help / procedure advice as to how to do this safely.
I need to do this because I have found that running FCP7 Studio under 10.8.5 there's some missing or odd keyboard and Timeline functions that were not there under Lion and FCP7 is a valuable tool for me that I don't want compremised. I'd like to be able to run FCP7 / Lion in a separate partition on the iMac.
I have partitioned the HD and there's about 700gigs of clean space on the second partition. I also have downloaded from my account on the App Store a copy of Install Mac OS Lion to my Applications folder and I also have a copy of it on a USB Thumbdrive.
So, what do I do now to safely install the second OS without messing up everything else that's on the machine in the prime partition?
Thanks!

Ok….I managed to work it out…..Installed Lion on the second partition, working fine now.
PM

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