OK... so let me clarify.
When you produce at a factory, as far as I know, the unit will pop out and go to a rally point that you define.
However, when you call for reinforcements, as far as I know, the unit will become part of the army (without extra clicks), and will proceed directly to its place in the formation.
These two things can happen simultaneously -- meaning you can have a queue at the factory AND be calling for reserves simultaneously.
But the factory can only do one thing at a time.
SO... my question is how the game handles that scenario.
Which orders are filled first?
What is the prioritization and sequence?
(and I wasn't sure whether repeating orders would be treated differently than one-time orders, so I listed two factories, instead of one).
Better? More clear?