Discounts percentage can be applied individually against the material item when creating a Quote/Sales.
Or in bulk via price levels:
Set up price levels
Bulk update price levels
Have a look at similar frequently asked questions or visit our FAQs page for more information
How can I show the SKU field on a Purchase Order?
Can we automate the process of assigning team members to a project?
Why is the pricing incorrect when creating a new Purchase Order?
Where can I see the converted value of the stock in Tidy?
How do I upgrade/downgrade my subscription?