Print portion of Numbers Spreadsheet

The way I do this is select the objects I want to print, then copy

Switch to the App Preview, then select the menu item "File > New from Clipboard"

now print, print to PDF or select all and copy to have a PDF on the clipboard, then paste where you need it

Another way to to view the content on the page while you are in print set up mode (you typed the key combination <command>+p or selected the Numbers menu item "File > Print…"). then exit print set up and adjust content as needed so you can choose to print a particular page or range of pages