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Install the package called system-config-lvm. That will give you a gui interface for managing lvm on the drive. After creating the lvm you'll need to format it like normal and you should be good to go.
But I never used LVM before on real systems, because it is really confuse to my low level of knowleage.
I've tried it this time as you sugested, I can create the volume and format in ext4 but one thing I don't understand is when I enter in the console a simple "df -h" the new volume created is not listed.
I really look for an GUI app that allows to create, delete, expand, in the future, the new partittion.
I wasn't suggesting you convert to LVM, merely asking if you were a current user. Centos website will likely have links to the Redhat manuals - have a look at the "Storage Admin Guide", it has a good walkthrough of the LVM GUI.
"df" shows mounted filesystems - regardless of whether you use "real" partitions or (LVM) logical volumes, they have to mounted on a pre-existing mount-point before they will be usable - or show up in "df".