In SuiNS, additional levels beyond this may not create new NFTs for each child in deeper levels. The total depth of 8 levels (+2 for SLD and TLD) represents maximum levels possible with nodes for each level, which means you can reach up to one.two.three.four.five.six.seven.eight.name.sui. Leafs can only go down one level from a non-leaf, meaning your structure may only support direct children from a parent node. An example implementation would involve ensuring each level is correctly set up with the appropriate parent before adding new subdomains. For five.six.seven.eight.name.sui, you need to ensure each preceding level is set and permissions allow further nesting.

The ownership model in SuiNS dictates that the parent of each level has control over its immediate children. To create a subdomain at the 4th level, you need to ensure you're using the immediate parent domain for creation. For example, if you have abc.sui as a 2nd level, and inner.abc.sui as a 3rd level, you must use inner.abc.sui to create a 4th-level subdomain like extra.inner.abc.sui.