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This process is usually called transfer air (air moves from one zone into another before exhausted outdoors). This post covers most of the modeling approach in DesignBuilder for transfer air.

To have the exhaust fan operate when the zone is occupied, you will need to do a few things:

• set the System availability manager coupling mode input field to 2-Decoupled. This will allow the exhaust fan to operate independently of central system fans.
• create a schedule with values of 1 when the zone is occupied and values of 0 for all other times, then assign that schedule name to the exhaust fan's Availability Schedule input field.