Deleting Primary Key --- High Priority -- Please help us

There is a custom defined table which had two primary keys and then moved the same to production. Since we got some requiremnent we added two more primary keys in the table in development server. We also activated the same in Development server. Now we need to delete the recently added two primary keys. It is a most important custom table. It is not allowing us to delete.

It gives us error message about lot of dependencies and foreign key used in other tables.

Please help us resolve this issue. FULL POINTS WILL BE AWARDED FOR THE SOLUTION. please help us resolve the same. Bottle neck situation.

Regards,

Siddhartha