If you start to type in what appears to be a numbered list, Word formats your manually typed "numbers" to an automatic numbered list. The main benefit of this option is that you do not need to click any button to start numbering and you can choose your numbering style as well. For example, if you type "(a) some text" and press Enter, it starts numbering using the "(a)" format.
Although there is a built-in Document Property called Revision Number (which you can see if you select File + Properties + Statistics, this is of no use, because it is incremented every time the document is saved. From a Quality perspective, the document revision number (we'll call it the version number from now on to distinguish it from the thing that gets incremented on each save) should be incremented each time a document is redistributed, and not each time it is saved (it could be saved many times during a single editing session).
A defined list can be interrupted by other paragraphs and lists, and can span different stories and different documents in a book. For example, use defined lists to create a multi-level outline, or to create a running list of numbered table names throughout your document. You can also define lists for separately numbered or bulleted items that are mixed together. For example, in a list of questions and answers, define one list for numbering the questions and another for numbering the answers.
If you go into Print Preview, the field will automatically update in the Headers or Footers. Unfortunately, if you also have the field in the main document, (for example, in the coversheet), going into Print Preview won't update it – but printing will, provided that you have Update Fields ticked under Tools + Options + Print. You can also update the field by selecting it and pressing F9. Or you can press Ctrl+A followed by F9 to update all the fields in the main document in one go.
A best practice that we recommend to our clients is to create a base/folio master –with styled and positioned footers and current page number special characters– on which all other masters are based. This allows a footer that may contain date or issue information to be updated once and the changes are reflected in all of the master pages. If your masters only have current page number special characters then you can just add them to each master and the page numbers will be reflected when each master is applied to your document pages. document numbering in indesign