A way to mass change "sort item" field in Assignments table (classification view)

Hi,

I have a few classes at material level, in classification view. For example: class "PLANT", class "PACK" and class "GENERAL".

In each material the sort of classes, in assignments table, can be different (in material A class "PLANT" can be first, but in material B class "Plant" can be second (after class "PACK" for example)).

I would like to change the location of classes, so class "PLANT" will be first in all materials, class "PACK" will be second in all materials and etc...

In order to organize the sort of classes in each material, I know that I need to change the nuumber in "sort item" field, in assignment table, in classification view.

But I have thousand of items and I would like to do it with mass change.

Do you have any idea how can I do it?

Thanks a lot,

Yael.