Data Upload at parent level

Hello Experts,

I want to upload the data at parent level insted of base level, for example i have a parent P1 and base level C1,C2,C3 now I just want to insert 100 at P1 and I want that the data should automatically get populated at my base level as (30% at C1, 30% at C2 & 40% at C3).

Is there any way to insert data into parent level and then populate it into base level by logic scripts or something.

Thanks & Regards

Ronit Kumar