How to prevent a unit from building

Dr Super Good

Spell Reviewer
Level 62
Jan 18, 2005
There are multiple ways.
1. Do not add it to the build list of the builder unit type in the first place (no icon).
2. Use a trigger to disable the availability of that unit type for a certain player (no icon).
3. Make the unit type require an upgrade or unit type (icon but disabled).

There is no way, that I know of, to remove a buildable unit type from only a specific unit, just all units of a certain player. You can however remove hired units at will if the selling structure is configured to support it.