Creating a Collection of bills where both cleared and uncleared bills should be gathered

Create two collections of Type : Bill and enable the attribute Cleared in one collection and disable the attribute Cleared in another collection. Subsequently, create a Union of both these Collections.

For example :

[Collection: List of Cleared Bills]

Type    : Bill
Cleared: Yes

[Collection: List of UnCleared Bills]

Type    : Bill
Cleared: No

[Collection: List of Bills]

Collection: List of Cleared Bills, List of UnCleared Bills