I need to know how to add a custom infraction option to the infractions menu.

I used to be a moderator on a site where if you were giving an infraction, there would be the admin created ones plus one where you would type in a reason, point value, expiration number, and a drop down menu for the rest of the expiration date.

Example:

Reason: | Type Custom Reason Here | Points: |Type Custom Value Here| Expires: |Type Number Here| |Dropdown menu containing Hours, Days, and Months|

All help is greatly appreciated :)

Thank you.