Appointment lower limit setting specific for each Service Provider


I’m asking your help in understanding how I could achieve the result described in the title.

I know A+ let me define a single lower limit setting, valid for all service providers.

But I urgently need to set a lower limit for a single service provider, and actually I cannot figure how to do it.

Can you help me show ? Have you got any code snippet I could use ?

Thanks as usual for your valuable help

Kind regards