Hi,

If you add the new fields to existing view, without inheriting it, you will loose the field from the view on upgrading it, then you might have to re add it to the view again. Instead of adding to original view, simply just create a view record that inherit the original view and add the field. This is a good approach where you will not loose the field from view on upgrading.

See this: Adding Custom Field From User Interface In Odoo

Thanks