However, the desired effect OP (most likely) wants is that the important divisions receive their upgrades/reinforcements first which can be controlled with update priority settings.
Yes that wil work to some degree, but it's not the same.
Consider this scenario if you have limited production capacity:
- You have high-prio theater A and low-prio theater B
- Theater A is fully upgraded and is temporarily not fighting, so excess production of new equipment is not stockpiled but starts going to theater B
- Some time later, theater A is involved in heavy fighting, and in needs of lots of reinforcements
- Since there is no stockpile of new equipment, theater A receives whatever is available, mostly obsolete equipment and however much new equipment can be produced daily, instead of the new equipment it should have received immediately from the stockpile
*if* theater B had upgrades completely disabled