Hey there, @BirchBlcok -
Welcome to the Community and thank you for posting your question.
One option you have would be to create an item for bottle deposits and recycling fees. This would allow you to add it to the transactions you wish and have the item be a flat fee per unit.
Please let me know if you were looking for something different and I would be happy to back to the drawing board.
Kassi
Community Moderator, Square
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