The short answer
Academy chat gives a direct answer: use Ctrl + Shift + number to add units to an existing control group.
That keeps the old group and appends the newly selected units.
Why this matters
- Control groups become more important as economy, production, and battlefield pressure all ramp up.
- Being able to expand a group instead of overwriting it keeps a player organized during larger games.
- It is a small mechanic with a big quality-of-life effect.
What a player should actually do
- Build the first group normally with the usual control-group bind.
- Select additional units and use Ctrl + Shift + number to add them.
- Keep role-based groups consistent so reinforcement management stays clean.
Common mistake
The common mistake is constantly overwriting groups and then losing track of key army elements during the fight.
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