How to setup Price adjustment based on Customer and Quantity?

Summary:

How to setup price adjustments based on customer and quantity?

Content (required):

Example Customer = ABC , Price 100$

Now if qty is between

0-100 Price : 100$

101-200 Price : 80$

201-300 Price : 70$

Similarly for Customer = EBF we will have different qty based pricing . How can this be achieved?

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):