"Sub categories" generally refers to smaller groups or divisions within a larger category or umbrella term. It helps to organize and classify things by breaking them down into more specific and related groups. Full definition
This breed is still developing and has produced many sub categories of American bully. (chicagobulliez.com)
The age of exit will also be highly dependent on an individual's performances as they through the various sub categories under this level. (saveourpublicschoolsma.com)
We have classified the dating into sub categories as mentioned earlier. (matchfinderpro.com)