Hi kelvin,
Is that a statement - or a question?
Assuming it's the latter:
.. Insert a Next Page Section break at the end of page 4.
.. Go to page 5
.. Access the page 5 header or footer
.. Unlink the page 5 header or footer from the previous Section
.. Insert a page # field and format it to start from 1.
Alternatively:
.. Access the document header or footer
.. Press ctrl-F9 twice to create a pair of nested fields (ie '{{ }}')
.. Fill in between the field braces thus - '{={PAGE}-4 \# "0;;"}'
.. Press F9 to update.
Note: the 2nd method won;t help if you're using a TOC or page # cross-references and you want them to display the correct page #s.