After a debate I have a concern, what is the ruling of Shia (saadat) to marry a Bohri cast? Is it allowed? I could not find any ruling under Agha Sistani.

As long as Marriage with Muslims concern there is no problem to marry either with a Sunni or Bohra or Zaidiya sects of Islam because they all are Muslims but the most important thing we should keep in our mind that marriage will not only join husband and wife but it connect two families and their culture too. Therefore if there is no issue of culture and your future children (because if the girl wants to remain in Bohra sect then it would most surely affect one’s children’s faith and ideology ) then you can do this.