HP h5400 - Manual (Page 205)

Scheduling
Reference Guide 8–11
4. Tap the Categories field to see a list of available categories.
5. Tap Add/Delete to create a category.
6. Enter the name of the new category.
7. Tap Add.
8. Tap OK to place your appointment in the category.
9. Tap the Categories field to place your appointment in more
categories.
10. Tap additional category names to select them.
11. Tap OK to list the categories you selected in the Categories
field.
12. Tap OK to save the category information and return to the
Calendar screen.