Formatting

link - support.microsoft.com/en-gb/office/format-field-results-baa61f5a-5636-4f11-ab4f-6c36ae43508c

Preserve Formatting

\* MERGEFORMAT 

Formatting first Character

\*CHARFORMAT 

This switch applies the formatting of the first letter of the field name to the entire result. The result of the following example has bold formatting because the R in REF is bold.

If a cross-reference field is not formatted as expected after it has been updated, you should turn on field codes of the field (Shift+F9) and check the field codes.
If the \* CHARFORMAT switch is present, the field will be formatted with the style applied to the first character inside the field code.
Note that Word sometimes automatically adds \* MERGEFORMAT to a field when the field is updated.
This may happen if you apply direct formatting to the text. If both \* CHARFORMAT and \* MERGEFORMAT are found in the field code, the \* MERGEFORMAT switch will override the effect of \* CHARFORMAT if the formatting between the two conflicts.
You can remove the \* MERGEFORMAT switch from a field simply by deleting it from the field code (remember to update the field afterwards).
You can remove \* MERGEFORMAT from all cross-reference fields via Cross-reference Tools" > Remove MERGEFORMAT Switch from All Cross-reference fields.

Formatting Dates

Formatting Times

Formatting Numbers