Hi @Peter Brand ! Welcome to the community :) I'm not sure I fully understand the workflow. Are you able to elaborate a bit more?
How can I created such a task card in one month
Do you have lists for each month? So you've got a "January" list, and all cards that need to be done for that month are added under that particular list?
copy the card into all other tasks
Are you wanting specific cards (the repeated tasks) to then copy to all other lists?
mirror these cards
Trello doesn't offer the ability to mirror cards within the same board, but you might be able to automate some actions using butler automation. What parts of the card need to be mirrored? (i.e. checklists, labels, etc.)
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