New Special Context

Hi, i’m a newbie, i want to know how to create a context which allow a extension to dial to the normal extensions and to a special group that only can dial between them. Something like this:
Normal Special
145 200
146 201

Extensions 145 can only dial normal extensions (146,147).
Extension 200, can only dial Special Extensions (201).
The new context can dial both Normal and Special.(145,146,147,201,200)

I hope you can help me.

Something like this?

exten => _14X,Dial(SIP/${EXTEN})

exten => _20X,Dial(SIP/${EXTEN})

include => g14x
include => g20x

Thanks, it was ver useful