The principle is that the current event is transferred to another PC's BOS as soon as you leave the event. This is the recommended procedure when you are using BOS on more than one PC; e.g. one PC for the duplication and another for the scoring.
You should FIRST create the target folder when you are to set up this type of export. That is to say, first install BOS on the target PC. Then browse for the target BOS on the exporting PC once the target BOS has been set up.