On my experience in Yii IRC, once in a while there would be someone that asks about how to create pages that handles 1 main model and its submodel and saving the changes in a single click. i wrote the example application on top of Yii2's basic application template that you can download here (i suggest you also run the acceptance test to see it in action):
[Dynamic Tabular Form App](https://github.com/fernandezekiel/yii2-dynamic-tabular-form-app/ "Dynamic Tabular Form App")