Deactivating Availability Check at Sales Area level

Hi Friends

My client's requirement is to deactivate availability check for a particular sales area. For all other sales areas, it should continue to happen as it is. Is it possible to do via configuration?

My understanding is we need to set up a new Item Category Group that will lead to determination of a new Item Category, and then switching off ATP check for the related Schedule line Category. OR setting Checking Group as "KP" in material masters of that country's plant (MARC).

Is there any other way to achieve this?

Thanks in advance

Vikas Gupta