Automatic discounting for customers

Hi All,

Sorry if this has been asked and answered before, but i am trying to understand the product discounting. Is there a way that I can set up multiple discounts for our products, and then allocated those discounts automatically to different customers?
For example, we automatically give a 30% Discount to Customer 1 on all purchases for Product Category A, currently we are manually populating this on their invoices. Is there a way to set this up automatically?

Ideally, we would like to set up 5 discounts ranging from 10% to 50% and then allocate those discounts to different customers so their invoicing can be completed faster.

Thanks for your time and help.