How can I create my own template and apply template?

Hi! I’ve been searching on the official websites for more information but there’s only tutorial that shows me how to use the template, but nothing about how to create a template. Is that a possible thing? I’ve seen people on youtube applying a template she created to another original character of her own.

Thank you for your continued use of our product.

Are you referring to the “Model template function”?
Please see the manual page.

Thank you!