Deleting ldev from a luse volume

[DJMC]

Hi,
How can I see what Ldev's make up my LUSE Volume? We only have RMC to manage the array.

Also is it possible to remove an Ldev from a LUSE without first releasing the LUSE?
I have created a Luse with two ldevs but have realised that i have used the wrong top Ldev and I now want to remove the Ldev which i added. I have not yet extended the disk at the OS but there is data on the original Ldev (top).

Thanks,
D