In this walk-through, you will learn how to create a custom Site Column. Follow the steps in the previous walk-through to navigate to the Site Column gallery.
Note that the column type choices are the same as for creating list or library columns. The main difference with Site Columns is that they can be reused on multiple lists and libraries throughout the site.
In this walk-through, you will learn how to add a Site Column to a SharePoint list. This walk-through will use the Demo List that was created in an earlier walk-through but any list or library would work.
Normally you would want to be very careful deleting a column from a list with data in it. Since this is just a test server and site, you should not be concerned about the potential loss of data.