I think you are better off just importing into both tables from the first table.
Thanks, I was under the impression that this could be scriptable, but the simplicity of your solution works just as well and did exactly what I needed. It took a little poking to find out exactly how to do your suggestion, so for the sakes of others who are not sure either:
Under File:Import Records - choose File. Under types of file, choose Filemaker Files, then click on your fm file and open.