Use the HTML select element (which must be assigned a name since it belongs to the form).  Then acquire its input appropriately on the server-side just like you do for text fields. Don't confuse the term select here with the term select used in SQL statements or in PHP functions like mysql_select.  Be sure to understand the role of name and value attributes in the HTML select element (and its companion option elements.)  Each menu entry has to be assigned a separate value that will be stored as a category for the Incident in the database