Place the cursor at the start of the page where you want numbering to begin
Go to Layout or Page Layout
Select Breaks
Choose Next Page under Section Breaks
Double-click the header or footer on the new section page
Turn off Link to Previous
Go to Insert
Select Page Number
Choose the position and style you want
Click Page Number
Select Format Page Numbers
Choose Start at
Enter the page number you want to begin with
Click OK
Close Header and Footer
Delete page numbers from the earlier section if needed