Yes, an automatic building hoist can be used to lift multiple objects at once, provided that the combined weight of the objects does not exceed the hoist's maximum load capacity. It is crucial to ensure that the hoist is designed for such operations and that all safety precautions are taken to prevent overloading, which can lead to accidents. The hoist should be equipped with a load limiter to automatically cut off power if the load exceeds safe limits, ensuring the safety of the operation.