If I understand you correctly you are asking if you can boot into a live usb edition and then from within the Live system upgrade a copy of Mageia 3 on the hard drive?
If so then the answer is yes, but I cannot image why you would want to do that. Why not just boot from the hard drive?
But if you really do want to do it from the live system then the procedure would be :-
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urpmi --auto-update --urpmi-root <path/to/hard/drive>
where <path/to/hard/drive> is the path to the file system of the hard drive mounted on the live system.
If the edition on the hard drive does not have software sources defined then you will need to do
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urpmi.addmedia --distrib --urpmi-root <path/to/hard/drive>
as well