How do I get rid of unwanted immigrants?

I've just gotten a large number of immigrants, most of whom I don't want, and I would like to get rid of them. I have a small room set up to flood with water, but short of giving those dwarfs I want to kill a bedroom in there I'm not sure how to get them to stay in there. So, basically, what is a good method to order a specific group of dwarfs to stay in this room so I can drown them?

Game version is 40d.

Solution 1:

• Create a squad for them.
• Create a point in the notes menu.
• Station squad at that point.
• Pull lever.

Solution 2:

You can also assign a burrow, and then assign the migrants to the burrow. The dwarves will all cluster into the space, allowing you to pull the lever and handle the problem all at once. (Assuming more than 10 dwarves).

Burrows have the additional benefit of being reusable each time a new migrant wave pops onto the map. Just assign the new guys to it and repeat.