(GrudgeBringer OK'ed that I replied to his PM here. I choose to do so, since that might benefit others, and it gives others the chance to address any mistakes or suchlike I make

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GrudgeBringer wrote:Do I always have to break down a complete army to add divisions to it (thru a Corps)?
To clarify:
Armies and corps are stacks, just with special properties.
Divisions are units, but a special kind that is able to contain other units.
Units can be added to stacks by dragging them onto the stack they are being added to, alternatively by dragging the unit or its tab onto the tab of stack it is to join.
Similarly, a unit can be taken out of a stack by dragging it out of the stack display.
I'm not sure what you mean when you say "breaking down a complete army", but you can add as many divisions to the army stack without making any changes to that stack's status as an army.
GrudgeBringer wrote:And biggest of all....I can get the 'enable division commander' button to light up but after I choose 1 unit to join him the + goes out and I never can tell what is in his unit and if I mouse over him it shows ONLY the one unit that I could add.
OK, I'm not sure I follow you here.
It sounds like you are adding the leader to the brigade without having formed a division. This is possible, since you can "embed" leaders in any brigade (AFAIK).
To create the division, make sure that you click the "enable division command"-button first
*before* you click the "plus"-button. Then you should be able to add more units, up to a total of 18 (including the leader)