Stefan has answered your problem with page numbering, I believe.

In answer to your question, yes it is possible to delete all section information (except one) however sections carry a lot of formatting information in addition to page numbering and headers/footers. Chances are good you do not want to remove that formatting.

If you do want to remove all section breaks, you would replace ^b with nothing. I would advise doing this on a copy of your document in case you discover you do not like the result. (Ctrl+Z works, too, but I would want a backup.)