Although you could add a table, textbox, picture or autoshape to a page as a 'floating' object (i.e. with text wrapping), that object has to be anchored to something. To a limited extent, you can have the object's position set relative to the page margins/edges, but editing text before the anchor is liable to result in the object moving - perhaps to another page. You can't simply drop an object onto a page and have it stay there regardless of what else is going on around it.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]