How do I install LION on a separate HD and keep Mtn. Lion on Macbook.

I am having problems with Mountain Lion and need help with installing and using LION on a separate hard drive.
Please help.

If your Mac Retina originally came with Lion Pre-Installed then you have one option.
That is to use the Internet Recovery system to download the original Lion version that was installed on your Retina MBP.
If your Retina came with Mountain Lion Pre-Installed there is NO option to install Lion on your system and any version of Lion available for download does not have the correct driver package to work on the newest MBP models, any of them.
To use Internet Recovery at boot hold down the Command+Option+r keys until you see a spinnin globe in the center of the screen. That will boot the system from the Online, Internet, Apple Recovery system servers which will be for the original version of OS X installed on your Mac. Have an extternal drive connected before you start this. Select Reinstall Mac OS X from the page tha is displayed and point it to the external drive you have connected. Lion will be downloaded to that drive and when it is finished downloading the install will reboot the system and start the install on the external.
Good Luck, Best Wishes and I hope this has helped.

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