Thanks for the effort. I was invested in a company

Thanks for the effort. I was invested in a company who drilled CBM Multi-laterals in China, and I have always wondered how they can run casing in multi-laterals. When the casing gets to a 'Y', it will go one way or the other, but then, how do they run casing down the bypassed part of the Y?. Just curious, I've tried to research it before, but came up empty handed. Thanks for the phone number, maybe I will call them tomorrow.