Sub assets should have an option in the Asset Management to be considered for the resource planning when their "parent" is associated with a production resource.

For example, If a machine is also a resource for a production order, and it has a motor that has particular maintenance that is costed and scheduled, then, when the Work Order for the motor maintenance is scheduled, these times must have the option to be considered or not in the Resource scheduled and its capability. In this example, the machine won't be available because its function depends on the motor.