Here's a shorter way to change auto to manual. If you do the style will remain but numbers will be manual.
1. Open the document whose numbering you want to convert. (You may want to open a copy of the document so that you don't mess up the original document.)
2. Press Alt+F11. Word displays the VBA Editor.
3. Press Ctrl+G. This opens the Immediate window. (If you get any other type of dialog box, such as the Find and Replace dialog box, then you aren't working in the VBA Editor; you are still in Word. Close the dialog box, make sure the VBA Editor is active, and then repeat this step.)
4. Type the following in the Immediate window:
ActiveDocument.Range.ListFormat.ConvertNumbersToText
5. Press Enter.
That's it; all the auto-numbered lists in your document are changed to manual numbering. If, instead, you want to affect only a limited portion of the document, make sure that portion is selected before you start the steps and then use this command in step 4:
Selection.Range.ListFormat.ConvertNumbersToText