A family of Microsoft word processing software products for creating web, email, and print documents.
This actually has nothing to do with linking or unlinking of headers or footers but with restarting numbering (which can be done without unlinking). In any section where there is a jump in the numbering, go to Insert | Header & Footer | Page Number | Format Page Numbers.... In the Page Number Format dialog, change the "Page numbering" setting from "Start at" to "Continue from previous section."