Why is it possible to link an assortment to a hierarchy?

Hi all,

I have a hierarchy (parent) with more than 200 customers (child). Instead of linking my assortment to the 500 customers, I would prefer to link it to the hierarchy. In this way, the (child) customers would inherit the parent's assortment.

I should point out that I can't link it to the sales prices because the prices are linked to a daily quotation.

Thank you

Soumia