Assigning a "Room Number" when an hour is specified

Thank you for this brilliant module.

I am using this module to create a university's school schedule as follows:

Each class has two Office Hours cck: one for the course, and one for its tutorial.
Both content types include "class name", "class room number", and "class days/hours".

Any idea how I would go about adding an option to specify a "room number" next to the specified hours of this model?

I have an intermediate knowledge in php so I would be highly grateful to receive some technical advice on this.

Thanks a lot!
Nimi.