Possibility to hide or restrict some items in group or whole group of items

[Adel (Adéla Šotolová)]

I would appreciate to have a possibility to hide some items in a group or even a whole group. As our high managers want to have daily tasks and tasks from project Gates at one place. The problem is that everything is visible for invited persons, but in some projects I have to share the board with our customers and I do not want to show them everything like daily tasks. Thanks