Create an array of VMS from a Predefinied array of VMs

I am not even sure if that makes sense.  Hope that it is clear.  What I would like to accomplish is have a predefined array of VMs.  I am assuming that this can be an attribute that I create as Name - vmsList with a type of ArrayVC:VirtualMachine.  I would then populate the array with the VMs I would like to select from.  I would also think I would create another attribute called selectedVMs.  This would also be an ArrayVC:VirtualMachine.  I would like to be able to be presented with the vmsList array and select the VMs I want and it be populated to selectedVMs array.  I am guessing that I am just missing the middle part.  Any help would be appreciated.  Thanks