To add a hierarchical structure table on a WordPress site, follow these steps:
1. Install and activate the TablePress plugin on your WordPress site.
1. Once the plugin is activated, go to TablePress and click on the “Add New” button.
1. Give your table a name and choose the number of rows and columns you want.
1. Under the “Table Configuration” section, select “Column Type” as “Hierarchy”.
1. Enter the data for your table in a hierarchical structure, starting with the top-level category in the first column and the sub-categories in the subsequent columns.
1. Customize your table by adding colors, fonts, and other styling options.
1. Once you’re happy with your table, click on the “Save Changes” button.
1. To embed the table on your WordPress site, copy the shortcode provided by TablePress and paste it in the post or page where you want the table to appear.
1. Publish your post or page, and your hierarchical structure table will be displayed on your site.