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
Which plan is best for my business?
How do I change a user password?
How do I undo a procedure that was accidentally charged out to a patient?
How do Pricing Levels work with different currencies in TidyStock?
Will the product items be able to have multiple discount codes on customer invoices?