Hi,
In TM it's not possible to have MIN/MAX amount for each scale item; you can only maintain one MIN and one MAX value for a SCALE.
But your requirement can be modeled using BREAK-WEIGHT calculation method in TCCS line and your rate table should be modeled to handled the MIN & MAX for each scale item.
More info on break weight can be found here: Calculation Methods - Charge Management and Service Product Catalogs - SAP Library
Thanks & Regards,
Tarun Kumar