By Selected NPA

Right-click a row containing the NPA you want to base the zone on and select Update Zone For All Rows in NpaNxx table. On the submenu, click By Selected Npa. This displays the Update Zone For All Rows in NpaNxx table by Npa window.

Select the zone from the drop-down list.

Click Update. The zones for all entries in the NPANXX table with the selected NPA are changed.