One way may be to have any unit or building whenever a building is created/unit trained said player creates into a unit group, and then when that player wants to re choose their class, destroy/remove every unit in said unit group.
As for the timer, I'm confused as to what you are asking for. Like a cooldown on how often they can do this? Or if they get destroyed, x amount of time before units start to respawn again?
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@user_877009: Go
One way may be to have any unit or building whenever a building is created/unit trained said player creates into a unit group, and then when that player wants to re choose their class, destroy/remove every unit in said unit group.
As for the timer, I'm confused as to what you are asking for. Like a cooldown on how often they can do this? Or if they get destroyed, x amount of time before units start to respawn again?