I have a dataset I replace every month. This one dataset is curently connected to many dataflows. So I have to update each workflow every month with the new dataset. Can I bulk change a dataset in many workflows at one time?
You can mass delete cards, pages, dataflows, datasets, people, and groups, and you can mass migrate cards or mass share pages with people, but you can't mass reassign inputs in dataflows. Not through the tools available to the average user, anyway.
You might be able to with a custom API or with the help of Domo support. I suggest getting in contact with your customer sucess manager or account executive as well as researching API documentation to see what is available through those two avenues.