Before doing any of this you might have to re-size your partition. Click Here
Open a terminal window and enable the debug menu in Disk Utility: (copy and paste the code below)
defaults write com.apple.DiskUtility DUDebugMenuEnabled 1

Start Disk Utility, go to the Debug menu and select “Show Every Partition”Insert your USB Recovery disk or conversely you can create this image from the Recovery partition on your MBP
Start Disk Utility, go to the Debug menu and select “Show Every Partition”Insert your USB Recovery disk or conversely you can create this image from the Recovery partition on your MBP
Select your Recovery HD partition (either on the USB or on your MBP – it will be greyed out) and click on “Mount”
Your Recovery HD will now be visible in FinderSelect the Recovery HD in the sidebar and select “Restore”
Under Source Select your InstallESD.dmg file from your Lion installer.
You will be asked to authenticate to continue
Select Restore and it will create a bootable installer.
Unmount your Recovery HD and uncheck “Show Every Partition” from the Debug menuTurn off the Debug menu in Disk Utility – in
Terminal:defaults write com.apple.DiskUtility DUDebugMenuEnabled 0
If it still mounts your drive go to hiding Partitions
