How to create same weight bins / Groups (?)

Hello everyone,

I'm fairly new to the forum so I don't know yet properly where to post my question

My issue is :

I have a data set with a large number of products (around 20 000) and Sales .

I would like to create groubs / bins .. that would weight each 25% of the total sales in a way that the first group would be the first most selling products that do 25% of the sales , the second group is the second most selling products that do the second 25% and so on and so forth

I have no idea how to do this, if someone can provide an idea how to i would be very grateful

Thank you,

Nouha