Thanks for the question.
Currently, you’ll have to create a separate off-site packaging instance for each different product you want to receive back. A feature request has already been submitted to be able to receive multiple products back at once, you can find it here - Send beer from multiple vessels to off site packaging and recieve multiple products back. You may want to add a vote to that request.
If you’ve already created the off-site packaging action, you should be able to undo it using the undo arrow next to the action on the batch in question.