Hi Deshetti,
The way I see more feasible to achieve this is "programming" in the main field GET_V method, and erase data from the company manually,
For example GET_V_Country should thence interact with the BOL entity where the data you want to change and delete them when the value is changed so that when you select a new value the page will reload and delete data dependent fields in the view are,
You must do debbug for operation ...
Follow link for example: