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Word 2013: If I add a template to a document then update the template
...will the document update automatically?
...will the document update automatically?
Do you mean if you created a new document from a template. Your very brief question is not very clear.
If you created a new document from a stored template then altering the template will not alter the document.
A template is a stored base design that you have stored for future use, so that it can be used to create a new document with the same format. Once that new document has been created & saved it is no longer connected to the template.