Renaming PCB Copper Layers in Multisim

[C90alien]

How do you change the names that Multisim assigns to the pcb layers?

I have a design that was originally created by an engineer who has since left the company and somehow he changed the default names for the inner layers.  I re-used part of this design for a new pc board and I am stuck with his original inner layer names.  I would like to change them either back to the original defaults or to more appropriate names for this design.  These layer names are even used now when I create a new Multisim file.