If you have a single rule in the "Template Rules" editor for the template, as shown below, you can add more rules as per your requirement.

In the Template Rules editor, to add another rule, after the previous rule's "}" ends, add a "," (comma) and then write the next rule, as shown here.

After writing multiple rules in the "Template Rules" editor, then click on the "Save Rules" button at the top right of the page to update the rules.

Once clicked, a confirmation message - "Rules saved successfully" will be displayed at the bottom center of the page, indicating that the rules have been updated.