In Simulink® Project, to add a new category of labels:
In the Labels pane, right-click Labels and select Create New Category.
In the dialog box, enter a name for the new category.
If you want to attach only one label of the category to a file at a time, select the check box Single Valued.
For example, if you want to create a category with labels for Prototype and Release and want to apply only one of those labels to a specific file, select Single Valued to ensure only one label can be attached.
You can also change the Type selection to change the data type t store in the label, for example, Double, Logical, String, None, or Integer.
To add a new label in any category:
In the Labels pane, right-click the category name under Labels and select Create New Label.
In the dialog box, enter a name for the new label and click OK.
To delete labels, right-click user-defined categories and labels and select Remove. You cannot delete built-in labels.
To create new labels at the command line, see Automate Project Management Tasks.
After you create labels, you can use them to label and group files. See Add Labels to Files.