(a) Two or more licensed authorized organizations may form and operate a unit as provided by this subchapter by:
(1) executing a unit accounting agreement; and
(2) stating in the unit accounting agreement whether the unit will use:
(A) a unit manager; or
(B) a designated agent.
(b) More than one unit may be formed at a single location. A licensed authorized organization may not be a member of more than one unit.

(c) This subchapter does not require a licensed authorized organization to join a unit. Except as provided by Subsection (d), whether to join or withdraw from a unit is at the discretion of each licensed authorized organization.
(d) The members of a unit may determine whether to allow another licensed authorized organization to join the unit. The terms of the withdrawal of a member from the unit are governed by the unit accounting agreement.