You can add alternate states to your document if you're using QV11 or newer. You can add those on the General tab of the document properties window. After creating them you can assign them to sheet objects on the General tab of the objects properties window. Selections in one alternate state don't influence selections in other alternate states or the default state. This way you can make sheet objects react only to a specific set of selections, those made in a specific alternate state.
You can try using bookmarks. That makes it easy to save and restore selections. However if you don't use alternate states there is only one selection state (at a time) in your document and it will apply to all sheet objects.
In the above picture When I select Student as Gopi that is affecting both Charts(Mark Details and Category),But I want only one chart should have that default selection .With applying sheet trigger on open I want Student as Gopi should be selected by default for the Mark Details alone.