@Claire_Ashton there's no automated job number, but every card has a short ID which you can access via a Butler variable, for example:
this isn't a particularly memorable job number, but you could always just refer to it using the first or last 3 digits, for example if the card id comes out as "95g2iwrH" you could just call that job 95g.
I don't think you'll be able to do it with Butler, but this Trellinator function would for example find the maximum job number on the board and add 1 to it and set the created card title to append a job number in the format "#X":
You can read more about Trellinator here:
I am pretty new to Trello in terms of Butler and Power UPS as well but played a bit with it from an automation perspective to know enough using the scripting platform and py-Trello library. The scripting platform has a simple way to trap events on the board like card movement (updateCard actually since the change is the list) or createCard. So once you can do that you can do many things including generating a reference number. I used random number for generating food orders on a Trello. What all this mean is some programming is needed.
others in the community can probably share with you an easier way. But I realised that to do transaction type of use case with Trello you will need some coding and some automation platform that works well with Trello.
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