Partition tab missing in Disk Utility

I have a 2011 iMac that came with Mtn Lion.  I have a WD 2 TB external HD that I reformatted, as it came with WinOS.  I formatted it with Disk Utility to MAC OS EXTENDED (JOURNALED).  I have Carbon Copy Cloner (v.3.5.3) and want to partition the external drive to be bootable. However, DU has no Partition Tab.  How do I then partition this to be bootable? 
I am using a separate HD for Time Machine.
Please advise.  Thanks!

Welcome to Apple Support Communities
You need to select the highest level of the external drive listed in the left column of Disk Utility.
Once one partition is created on the drive and you select it, that partition cannot be further partitioned, so the Partition tab does not appear.

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