I want to make partition in Linux

I try to install RHEL 6 on Virtual machine. But it won't ask me for partition.  I want to make partition in that but it automatically does default installation.

Please any one suggest what should be done.

It's quite urgent.

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Go through this link

http://tutmaster.com/how-to-install-red-hat-linux-complete-step-by-step-guide/

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kind refer bellow link

http://www.tecmint.com/red-hat-enterprise-linux-rhel-6-installation-guide-with-screenshots/

and change on step 9 select custom layout

https://www.sendspace.com/file/oxjuck follow these steps