@Jed_Campbell is correct with his example. And here is another one to guide you along.
You can open a Data table and then create a New Column, assign values, as in sequence data, as you did before. If you right click and add the new column, a suggestion is to go ahead and change the name of the column, format it, and try and do that in one step. It will work to do multiple steps, but your workflow is cleaner this way.
My other column, "example" I added with a script - so this step would be a custom action step.