Kim was very recently heard to utter:
I find it ridiculous that Word can handle different page orientations
through different sections but Publisher (a superior PUBLISHING
program) cannot. This has caused much grief in an office environment
where our printing centre is far too busy to feed extra pages in and
out of a printer that can capably print double sided documents.

Did you actually read Don't suggestion?
If you followed his suggestion, your duplexer would be able to duplex the
document automatically.

Alternatively, you could create two separate documents, convert them both to
PDF, and concatenate the PDF files in Acrobat. Then you could print to your
duplexer once again.

I realise that this is a limitation of Publisher that we could do without.
But you don't have to let it stop you from accomplishing what you want.

--
Ed Bennett - MVP Microsoft Publisher