Is there a way to combine simplex and duplex printing within the same document?

I have a document and I want to print the first x pages in simplex mode,
then the remaining as duplex. In the first x pages I could just insert blank
pages but I do not want word to number the blank pages.

Is there any way I can program word so that, in the first section, if the
text starts to flow onto an even numbered page it automatically jumps onto
the next odd page and the intervening blank page is not numbered?

Hope that all makes sense