In the absence of any information about what you may be numbering, I can only point out the possibility of using a formatting switch. e.g. You could use SEQ fields to create the numbering.

{ SEQ MyNumber \# "'REQ_'0000" }



(The brackets { } are inserted with CTRL+F9 Save as Autotext or autocorrect for ease of re-insertion).

The only downside is that the SEQ fields do not update automatically. You can use F9, or you may find it more convenient to add a macro to the QAT (Quick Access Toolbar) to facilitate updating. The example, code at http://www.gmayor.com/installing_macro.htm will do the job.

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Graham Mayor - MS MVP (Word) (2002-2019)
Visit my web site for more programming tips and ready made processes www.gmayor.com