You need to separate "section break" for each page of word. Take word2007 as an example, choose Page Layout-Separator-section break-Next Page. This will add a section break between the two pages to be separated. Then select the header and footer of the second part. Cancel Link to Previous Title in the Design tab. In this way, the preparation work is completed, and different page numbers can be set separately.

Section 1: Selecting Design-Page Number-Page Number Format-Selecting Coding Format I- Starting Page Number; Select an item from Page Number-Page Number Bottom to set the page number of the first section;

Section 2: Move the mouse to the page number setting position in Section 2, and repeatedly select Design-Page Number-Page Number Format-Select Coding Format 123- Start Page Number; Select an item from Page Number-Page Number Bottom to set the page number of the second section.