I want to apply the same function as we did with meta-description for sub-categories.

Example:
Template of parent category TITLE: {CATEGORY_NAME} Cats & Kittens for Sale

Parent category TITLE: Cats & Kittens for Sale
1. Child category TITLE: Sphynx Cats & Kittens for Sale
2. Child category TITLE: Russian Blue Cats & Kittens for Sale
3. Child category TITLE: Siamese Cats & Kittens for Sale
4. Etc.