Select lists are a popular format - especially when you want your collaborators to adhere to specific naming or labeling. You can add as many options as you want and see them clearly in a list - no more comma separated items. And, from the select list menu, you can easily re-order your list or edit options.
The best part is that when you edit an option in the select list menu, all rows with that option will automatically update.
If you have an existing column that you want to turn into a select list column, click the header and change the format of the column to "Select list." Coda will use the items that already exist in that column to populate the options for that list.
In addition to Select lists, Coda has a wide variety of column formats to choose from. You can learn more about your options here.