So players are selecting between 3 units which one they want to be theirs.
But I have edited some stats, and added some abilities on certain units, so I want them to be able to select the unit and see its Command Card, but not be able to give it any order.

How do?

You don't want to just show the abilities using dialogs and triggers?

First you grant them control of the unit, either by giving it to them or allying them with the player that owns the unit.
Then you pause the unit with the 'pause/unpause unit' trigger action so it can't react to any orders.

Too much work.


This would prevent the units from moving or casting spells? It's all I need.

Yep.

Worked perfectly.
Solved.