How Did a Nomad People Rule an Empire?

How did a nomadic people rule an empire? How do you do that? I mean, when we think of empires, you imagine that you need some sort of, some sedentary structure. Soo dipped into a bit of the answer, i suspect. The way they do with people, as i said, absorption. Each time they conquered a new people, like, for instance, the tangot in central and western china. To the tangot people, were integrated into their armies. They also conquered a important sultanate in central asia and iran. There they were like persian secretaries. They would accountants as well, like merchants, accountants. Ah,