34 Tex. Admin. Code § 43.18
A motion for consolidation of two or more appeals, applications, petitions, or other proceedings shall be in writing, signed by the movant or the movant's attorney, and filed with SOAH, TRS, or the administrative law judge, as applicable, prior to the date set for hearing. The motion shall state the number and style of all proceedings sought to be consolidated, and the movant shall file a copy of the motion in each proceeding. No two or more appeals, applications, petitions, or other proceedings shall be consolidated or heard jointly without the consent of all parties to all such proceedings unless the administrative law judge or executive director shall find that the two or more appeals, applications, petitions, or other proceedings involve common questions of law or fact, or both, and shall further find that separate hearings would result in unwarranted expense, delay, or substantial injustice. Special hearings on separate issues may also be allowed.
34 Tex. Admin. Code § 43.18