I used a routine at a previous office that did what I am going to ask of the forum. Below are samples of layers that I am using now. The N = New, E = Existing and D = Demolition. I want the ability to select multiple objects from N layers and switch to corresponding E layers, N and E to D. I welcome any help that can be provided.
G-D-Case-Flor G-E-Case-Flor G-N-Case-Flor
G-D-Door G-E-Door G-N-Door
G-D-Wall-Full G-E-Wall-Full G-N-Wall-Full