How to filter properties in smart filter?

Question

1C-Bitrix

Good afternoon!
I display a smart filter. There is a property Discount "property = string" in which the percentage of the discount is displayed . For example: -65% ; -23%; -44%
Tell me how to sort the value -23% ; -44%; -65%
or -65% ; -44%; -23% ?

Answer 1

Create a property type = directory, plural. And store discounts in it.