Re: Use Create and Delete branch actions on BOARD in new ux
Have you looked into the "Forms" functionality? If you add a card of type "Action", and then select the "forms" option it allows you to add items to a list using a form type setup. Also as an alternative to the form, a process can be created to add items to a list and that published to the dashboard.
For the delete functionality, while there is not an explicit option, you can create a boolean line item called "Delete" in a grid you have published, then create a process to delete if the boolean is checked, and publish that as an action on the grid.