You may store the address of the working storage group which you intend to pass to the called program in a S9(08) COMP variable and pass the address variable as COMMAREA to the called program.
In the called program, the address will be present in the COMMAREA which you may use point to the group variable in the linkage section which has the same layout as that in the calling program.
This may used only when calling using LINK. If you are calling the program using XCTL, then you may initially perform a GETMAIN, populate it with the values you intend to pass and then pass the address of the GETMAINed area to the calling program. This is because the area obtained by CICS for the calling program is released during XCTL. If a FREEMAIN is not done, then the area obtained using GETMAIN is released only at the end of the task.