New Branch and GL Entry- Help

Hi,

We have recently open another branch in GP we don’t want to create separate company. We  do have separate GL account for new branch I want to track all GL base on Site we have created for new branch. I have following task how we can accomplish in Dynamics GP.

1) All Purchase should get affected as soon as we select  site

2) All sales GL should get affected base on site selection

We don't want user to go and select or modify GL account in distributions.

Is it possible? Any views on this will be highly appreciable.

Thanks

Sandip