Code:
  +-------------------------------------------------------------------+
  |                       school                               campus |
  |-------------------------------------------------------------------|
  |          School A / School B                  Location1/Location2 |
  |                     School C                           Location 3 |
  | School X/ School Y /School Z   Location 4/ Location 5 /Location 6 |
  +-------------------------------------------------------------------+
I would like to create new observations by taking "/" into account. For example, obs1 will be school==School A and campus==Location1 ; obs2 will be school==School B and campus==Location2.

Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input str28 school str34 campus
"School A / School B"          "Location1/Location2"               
"School C"                     "Location 3"                        
"School X/ School Y /School Z" "Location 4/ Location 5 /Location 6"
end