Hi Angelo
As the Help topic says, "In paragraphs that are formatted with the
built-in heading styles, Word restarts the numbering at 1 in each
successive heading level. If headings that contain AUTONUM fields are
followed by body text paragraphs that also contain AUTONUM fields,
Word restarts the numbering of the body text at 1 after each heading.
If the headings don't contain AUTONUM fields, body text paragraphs
that contain AUTONUM fields are numbered in a continuous, sequential
series throughout the document."
There is no field switch or other magic incantation to restart the
numbering.