Running two OS on mac

Please can anyone help? I have a Mac Pro Quad Core Intel Xeon running Snow Leopard, I have partitioned the drive using disk utility and I am trying to install OS 10.5.1 (Leopard no snow) on the 2nd partition, but I cannot get the OS Leopard disk to show/install.
The 2nd partition I created shows on the desktop, but not in the startup menu.

If the version of the OS you try to install won't support your Mac, it won't matter where you install it. You can use Mac OS X versions (builds) included with Intel-based Macs to see the minimum OS version & build that your Mac Pro will support.
For instance, if you have a Mac Pro (Early 2009) model, you may be able to install & run 10.5.6, build 9G3553, but no version earlier than 10.5.6 will work, period. Moreover build 9G3553 is only available on the system discs that shipped with some early 2009 models, so even the retail leopard disc that installs 10.5.6 will not work with it.
The reason for this is that earlier OS builds do not include hardware support for models released later. There is no workaround for this; the partition or HD, internal or external, must have a version capable of supporting the hardware installed on it or it will not be capable of running the computer stably, if at all.
You can verify this with Apple support UK if you still doubt this. Just make sure they know exactly what model you have, & refer them to Article: HT1159 if necessary.
If you do not know exactly what model you have, the simplest way to determine it is to go to Apple - Support - Technical Specifications & enter the serial number of your Mac in the "Search Tech Specs" box, then press return. Alternately, go to Apple - Support - Check Your Service and Support Coverage & enter the serial number there. Either method should show you the official name of your model.

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