No Sweat WP Internal Links Lite allows you to create silos, powerful internal linking structures that improve your on-site SEO.
This is a limitation of the Lite version. If you upgrade to the full PRO version you will be able to create the four of them.
You can access the PRO version of No Sweat WP Internal Links here
Not with the Lite version, but of course you can do it in the full-fledged "PRO" version.