Once you know that Zoho Sites' native 301 Redirect tool only accepts individual, one-to-one rules, the next question is usually whether you can speed up the process by importing a whole list of redirects in one go rather than entering each one by hand through the Manage > Settings > 301 Redirect screen.
There is currently no built-in facility in Zoho Sites for bulk-importing a list of redirect pairs, for example from a CSV or spreadsheet. Every old-URL-to-new-URL mapping must be added manually, one at a time, through the interface. This applies regardless of how many redirects you need to configure.
If a URL restructure means you need a significant volume of redirects, for example when renaming a whole blog or content section, it is worth raising the exact number with Zoho Sites support directly. Support can review the scale of the requirement and check whether any assistance or alternative approach is possible on their end for cases that go beyond what the standard manual workflow can reasonably handle.