How to create a model/controller/etc in Yii2 Gii without a web interface?

Question

Yii

Throw a simple example or manual, any information, except for the standard guide, where something is created through the web version of the form.

That is, I need to conditionally fetch the data of the future model (className, id, etc.), and the method (which fetch referred to) will already generate the model I need.