Dual boot Snow Leopard and Mavericks or newer

I have a late 2008 Mac Pro running Snow Leopard in order to use my older editing software.   I would like to dual
boot with a newer operating system on another partition.  Feel really behind the times.
I am hoping I can do this but do not know just how to go about it and maintain my current setup on one
partitions.   Do not know that if I try to upgrade operating systems I will be able to direct the new operating
system upgrade to be on the other partition.  I know how to create the new partition, just not how to get
a newer operating system on it.
Any help or suggestions would be appreciated.
Kirk

Start by creating a new partition on your hard drive using Disk Utility. Download Yosemite from the App Store. Do not install it on your Snow Leopard partition. Instead change the destination to your new volume.
To resize the drive do the following:
1. Open Disk Utility and select the drive entry (mfgr.'s ID and size) from the left side list.
2. Click on the Partition tab in the DU main window. You should see the graphical sizing window showing the existing partitions. A portion may appear as a blue rectangle representing the used space on a partition.
3. In the lower right corner of the sizing rectangle for each partition is a resizing gadget. Select it with the mouse and move the bottom of the rectangle upwards until you have reduced the existing partition enough to create the desired new volume's size. The space below the resized partition will appear gray. Click on the Apply button and wait until the process has completed.  (Note: You can only make a partition smaller in order to create new free space.)
4. Click on the [+] button below the sizing window to add a new partition in the gray space you freed up. Give the new volume a name, if you wish, then click on the Apply button. Wait until the process has completed.
You should now have a new volume on the drive.
It would be wise to have a backup of your current system as resizing is not necessarily free of risk for data loss.  Your drive must have sufficient contiguous free space for this process to work.

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