How to rework below ABAP - OOPS code globally? SE24

Dear friends,

how to declare the below code globally in se24?

class cl_observable definition.

 public section.

 interfaces: lif_observable.

 aliases: register for lif_observable~register,

 unregister for lif_observable~unregister.

 methods: notifyobservers.

 "Mainly this below code
 private section.
 data: mt_observer type standard table of ref to if_observer.

endclass.

Thanks in advance

Sudarshan David