Call pickup group

Sir,

I want to create a number which is use to pickup call from specific extensions. for example i have 10 extensions 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 and i want when same one press 125 than it will pickup call from 10, 20, 30, 40, 50 extensions and when press 126 than pickup call from 60, 70, 80, 90, 100 extension.

Rajeev.