Does the Immigration Bureau have an auxiliary police establishment?

No, the police of the Immigration Bureau belong to the career police, which was set up to make up for the shortage of police force, not the establishment of civil servants, so there is no auxiliary police establishment. Establishment usually refers to the establishment of institutions, the quota of personnel and the distribution of posts. The amount of financial allocation shall be formulated by the preparation departments at all levels, and the financial department shall allocate funds accordingly.