To create such a page, start by creating a normal page to display registers from one of these boards, then pull down the Configure menu of the page and select "Configure Page". This will bring up the page configuration dialog. At the bottom of this dialog you will see a text entry field that is annotated with the words "Enable switching between numbered boards who's names all start with". In this field write the initial part of the board name which is common to all of the boards in the group, omitting the trailing number of the board, then hit the Apply button. Provided that the viewer is currently connected to the control program, or reading from the archive, you should then see a row of numbered buttons appear just below the menu bar of the page. These are the numeric suffixes that the viewer found in the register map for the specified board prefix. Thereafter you can switch between boards by pressing one of these buttons.
What actually happens when you press one of these buttons is that all of the register display fields on the page are scanned for register names that start with the specified board prefix, then the number that follows this prefix is replaced with that on the button that you pressed. The viewer then requests updates for this new selection of registers from the control program (or the archive).