After linking a CAD file into Revit and deleting some layers inside Revit, is there a way to resurrect those layers without removing the link and starting over. I've tried "Reload" and "Reload From" to get the deleted layers back.

I thought deleting layers was a good way to get around having to set visibilities for each view which has a copy of the linked CAD file, but if I can't resurrect layers....maybe not so good.

Thanks in advance.