How to add LVM's after an install?

[Xn Nooby]

I have an existing 5.10 Ubuntu install, and I can't figure out how to create
a logical volume.  I vaguely remember it asking me something about LVM's
during the install, and I may have chosen not to use it at that time.  In
addition to my boot drive, I have 3 extra HD's in my machine - and I would
like to combine them in to a single gigantic drive.  I added qparted and
gtparted, but did not see an option to create an LVM in those programs.  I'm
probaly missing something obvious.

Any suggestions?
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