Word will insert the appropriate number and components, as shown in Figure I. When you do, Word automatically inserts the formatted number.
It can be done, but changing styles that are already in use almost always has far-reaching repercussions.
Cross-references in Word 20 create links in your text to captions and notes elsewhere in the document, such as captions on figures and tables, and footnotes and endnotes.
During editing, however, the caption and note numbers can change, as can page numbering.
Or you can opt for the more efficient solution and create and apply a numbered style.
Unfortunately, that can get you into even more trouble, if you don't know what you're doing.