well well its working
we had all functions(copy,psdisplay....) of VMM_DATA in all our vmm_data extension classes instead now we are using vmm macros (`vmm_data_member_scalar(variable,DO_ALL).....)and our TB is reduced to half its original size.
One can refer VMM standard library user guide version1.12 page A-148.
but i am not sure if i do it for classes using `vmm_data_member_handle(handleof a class,DO_ALL) do the handle i use should always be of a class which is derived from VMM_DATA?I have given a handle of a class which i defined which is not extension of VMM_DATA its giving null object access . Need to check on this.