Ok so I been updating to all developer P.. and on 4 I wanted to install only Lion but couldn't so what i did to only having lion was
1.Format your drive for 2 partitions
2.Install SL on the 2 partition --untitled 2
3,Install Lion on partition 1
4.Boot to Lion
5.Open Disk Utility
6.Delete SL and then drag the first Partition Down
There it is if Lion is Your second partition you will lose whatever space you had on it
Good luck still buggy like ios5
That's not a good idea, because it forces you to have two partitions in your boot drive. Some people might want just one.
The creation of bootable Lion dvd/usb stick makes much more sense since it uses only a DVD or stick, and doesn't touch your actual boot drive.