How to handle the unsuccessful execution of a procedure through exception

Question

I have to run a sequence of procedures through a procedure. The execution of a succeeding procedure depends on the successful execution of the preceding procedure.What i want is that a procedure is only executed when the preceding
procedure is successful.

Answer 1

I wonder which is the best practice ...
1) to pack all exceptions - occured in the sub-procedures - in the main procedure
or
2) to pack all exceptions - occured in the sub-procedures - locally , in the body of these sub-procedures....???
In other words....
procedure main
as
   begin
      procA;
      procB;
      exception
         when ......
         when .....
         when .....
    end;
procedure A
as
  begin
      return;
  end;
procedure B
as
  begin
      return;
  end;
OR
procedure main
as
   begin
      procA;
      procB;
    end;
procedure A
as
  begin
      exception
        when ...........
        when ...........
      return;
  end;
procedure B
as
  begin
      exception
        when ...........
        when ...........
      return;
  end;Thanks...
Sim