I actually found it. Only in CI can the creature be taught how to build. Or playing Ultimate, where the Titan can be also taught to build.I know the Creature can supply materials to buildings in need but not sure if it can build in the first game. Haven't played in awhile but I have a lot of old material on Creature training and knowledge in general. Maybe there is some info in there. I am adding a link to all my FAQ stuff if you'd like to look through it yourself. May be helpful, may be totally useless.