You take all the command points of the models that possess cmd and pool them, then those with orders can use the points out of the pool to use their order(s). If it's a temporary command, you get the points back next turn. If it's a permanent command, you don't? And if you lose anyone with a cmd stat, you lose that many points in your pool for the next turn, yes?
Yes to everything, except that it's the expense in command points that is either temporary or permanent, not the order itself (just making sure that is clear). The detailed explanation is on p13 of the current
quickstart rules. Please let me know if those points (or any other for that matters) need further clarification/rewording.