If I want to say that a fixed gross margin rate is necessary to a group of spare parts, another fixed gross margin rate to a different group of spare parts, etc. Is it okay to say like this?
"The introduction of a fixed gross margin rate is necessary to each group of spare parts."
I'm afraid that the above might mean that a single gross marging rate is applied to all the groups.
I want to say that all the groups are different in gross margin rate.