Partition of hard drive to run 10.7 on one and 10.10 on the other

Anyone know if I can partition my hard drive on my MacBook to run OS 10.7 on one and
OS 10.10 on the other?
The reason is that I have business programs that will not run on the latest version
without an expensive upgrade.
And one program is not written yet for the upgraded OS.

If that's true, then do not disturb the 10.7 partition. Instead you want to divide it to create space for another partition. Open Disk Utility in the Utilities folder. You will see two entries in the sidebar list - an outdented one and an indented one. The latter is your Lion volume. But you need to select the outdented entry then click on the Partition tab in Disk Utility's main window. You should now see a partition map. Part of the map is blue (this is the used part) and part is white (this is the free space.) At the bottom you will see two buttons. Click the Add [+] button. Disk Utility will divide your disk space in half if it can. You must then select the lower rectangle and re-size it to what you want to allocate to Yosemite. I suggest it be no smaller than 50 GBs. Leave the upper portion for your Lion installation. However, be sure you are not over-writing an of the blue part in the partition map or you will lose data. Last click on the Apply button and wait. It may take a while for the process to complete so be patient.
When it's done you can now install Yosemite on the new partition. If you have the Yosemite installer then when you run it be sure to change the target drive to the Yosemite partition on your drive so it doesn't overwrite the Lion partition.

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