You are asking for a Cross-Reference functionality but don't want to use that functionality. Why? This is exactly what you should be using.

Using an Excel-like formula's whereby you specify a cell address won't give you a cell reference that automatically changes if that cell moves. Word just doesn't work the same as Excel. Also, if you wanted it to by a hyperlink then you should be using Cross-Refs which do that already and takes care of both requirements at once. And finally, because you are using autonumbers in that source cell, there is no 'content' that a cell formula would display. If you typed the numbers rather than using an autonumber there would be content that could be displayed in a field eg {=Sum(A4)}

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Andrew Lockton
Chrysalis Design, Melbourne Australia