Hello Rohit,
did I understood you correctly - you wish to have a separate field in VKM1-VKM4, which would serve as an indication that this customer is a 'focus' one, you did not mean that you always wish to block orders for such customers, is this correct?
If all you wish to do is exactly that and if the company can afford some budget for development, then I suggest that you have a look at sap note 779389 - VKM*: Extend list with user-defined fields, it describes what you need to do.
I am not 100% sure that I understood which field you refer to.
Could you add a screenshot (don't forget to clear the confidential info before posting the attachment)?
Despite that, if you can explain what is the business meaning of a 'focus' customer (does it mean more risky, or VIP or something completely different), maybe I could try to suggest some alternative option, which could be achieved with customizing settings.
Edit: no need for screenshots from the master data, apologies about that part. I should avoid logging in to SAP systems when I am half-asleep.Image may be NSFW.
Clik here to view.
Message was edited by: Veselina Peykova