How to add same item in large number of BOMS with same qty

Dear All,

I want to add a single item in large number of BOMS in mass with same qty at last line number of all corresponding BOMS and last line number can be different for all BOMS.I am not able to it by CEWB.CS perhaps will not serve purpose as it is needed to be added in last line of all corresponding BOMS.

Thanks and advance