Workflow Automation to make custom field match label
I would like to make a custom deal field that automatically matches the deal label.
We label deals based on the purchase number of that organization e.g. purchase 1, 2, 3, 4, 5, etc. but I want to be able to see this label in the left column of the deal, not have to scroll up to the top to see it, so was thinking to make it a custom field that is automatically populated to copy the label. If this is possible, what workflow would trigger this?