Boot older version of mac as a second partition

Hi I'm running OS X Yosemite on my mac currently and want to make a partition so that I can boot OS X Lion. I have the InstallESD.dmg file and a 4.7GB re-writtable DVD that I've burnt it to and I have created the second partition ready for the operating system to be loaded onto. As far as I can tell, I just need to hold Alt while the mac restarts for me to select the DVD as the startup disk for the installation to start. When I click on the disk however, it just boots into the regular Yosemite startup disk. I want to install Lion from the disk I've created onto my second partition.
Any ideas?
Many thanks,
Dan

It won't boot from the DVD. What you need to do is put it on an 8 GB USB flash drive properly partitioned and formatted for OS X.
Make Your Own Mavericks, Mountain/Lion Installer
After downloading the installer you must first save the Install Mac OS X application. After the installer downloads DO NOT click on the Install button. Go to your Applications folder and make a copy of the installer. Move the copy into your Downloads folder. Now you can click on the Install button. You must do this because the installer deletes itself automatically when it finishes installing.
2. Get a USB flash drive that is at least 8 GBs. Prep this flash drive as follows:
Open Disk Utility in your Utilities folder.
After DU loads select your flash drive (this is the entry with the mfgr.'s ID and size) from the leftside list. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button. Click on the Partition button and wait until the process has completed.
Select the volume you just created (this is the sub-entry under the drive entry) from the left side list.
Click on the Erase tab in the DU main window.
Set the format type to Mac OS Extended (Journaled.) Click on the Options button, check the button for Zero Data and click on OK to return to the Erase window.
Click on the Erase button. The format process can take up to an hour depending upon the flash drive size.
Use DiskMaker X to put your installer clone onto the USB flash drive. Wait for the process to complete which will take quite some time.

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Boot older version of mac as a second partition

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