The presiding officer upon his own motion, or upon motion by a party or other person joined in the proceeding, may order proceedings involving a common question of law or fact to be consolidated for hearing on any or all of the matters at issue in such proceedings.
Ga. Comp. R. & Regs. R. 295-12-.01
Ga. L. 1931, pp. 7, 35, 37, as amended.