You can record the student's bus name and number at Admin > Config > Buses.
In this area you can see if any Bus information has already been input, which you can Edit or Delete (by first clicking on Edit).
Alternatively you can click Add New to set up an additional Bus route, then select Insert to save.
The Bus name will be available to select in the Student Profile under the Extended Tab, within the Further Information section.
You can report on this area in Reporting > Reports > Student (tab) > Student Travel
The report can be filtered to show all students who travel by Bus by entering 'Bus' into the search box under the column header Usual Mode of Travel. Alternatively you could enter the bus number into the Bus column's search box to identify all students using that particular bus service.