Beauregard was caught up in the same "multiple chain of command" problems that had dogged Joe Johnston during the Vicksburg Campaign. Although he was nominally the "theater commander," Hood communicated directed with the President, bypassing Beauregard completely in most cases. Beauregard felt he couldn't really protest, because he never was one of Davis's favorites either. So he basically just did what he could to shuffle resources towards the Army of Tennessee to the best of his ability and based on his limited understanding as to what Hood's plans really were.
BTW, others on this forum will disagree, and of course that's what makes it fun, but I like Wiley Sword and tend to lean towards many of his assessments of Hood, although I will admit I've softened somewhat in reading some of the more recent scholarship on him. Bottom line in my mind...Hood was the perfect example of the "Peter Principle" in action.
Regards,
Mike