Sony,

It works fine for me. Once you fix the typo that you have that's preventing the PRGs from compiling. You need ENDDEFINE instead of ENDEFINE. I also added a dodefault():

*-- BaseClass.prg
DEFINE CLASS myProcess As Session
PROC doProcess
*: doing my Processes here
? program()
ENDPROC
ENDDEFINE

*-- SubClass.Prg
DEFINE CLASS CustomProcess As myProcess Of BaseClass.Prg
PROC doProcess
*-- running custom code
? program()
dodefault()
ENDPROC
ENDDEFINE


*-- RunProg.Prg
Local loProc
loProc = NewObject("customProcess", "SubClass.Prg") 
loProc.DoProcess()

I had all three programs in the current directory. Running VFP7SP1.

>My Problem is, I get "Class Definition 'CustomProcess' is not Found'" error at the object initilization.