Hi,
Data : x_fieldcat TYPE lvc_s_fcat,
t_fieldcat TYPE lvc_t_fcat.
For the field you want.
x_fieldcat-do_sum = ' '.
Append x_filedcat to t_fieldcat.
Use the internal table t_filedcat in the Reuse_alv_grid_display.
I think it will work fine.
Regards