Hello, I have wanted to assign a price rate to my website clients but unfortunately I have not been able to. I have used relational fields throughout the Studio app but the final field does not allow me to generate a dropdown and choose the rates and its type cannot be many2one. Is there a way to do this allocation and price visualization in a simple way without using an app?. 

I am new to odoo and there are some things I still don't understand. I would appreciate the greater amount of help.