Hi Son,
If we are talking about default.lgf then only new data will be processed by the script. No *XDIM_MEMBERSET required, only *IS condition.
If you don't specify ENTITY in *REC as a target overwrite, then *REC will split B701 for each entity. No additional code required.
Just test! By the way it's always better to post your BPC version and SP.
Vadim