you have to play around with the abilities of these structures. go to data and search for the gateway, then go to abilities and remove the "Upgrade to warp gate instantly" ability.
If it comes to what units you can build, you have to change the "train" ability from the structure. The robo facility has an ability called "robotics facility - train (robotics facility). Go to that ability and go to ability info. Here you can set up all the units you want to train from a structure which has that ability. simply go to the reaver and change it to the colossus. you can also change the button at the top. this isnt necessary, but you need to remember the name of the button. Then go back to the robo and go to "command card". remove the reaver button and create a new button that has a colossus on it. Command Type: "Ability Command". Ability: "robotics facility - train (robotics facility)" Ability Command: the name of the button.
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you have to play around with the abilities of these structures. go to data and search for the gateway, then go to abilities and remove the "Upgrade to warp gate instantly" ability.
If it comes to what units you can build, you have to change the "train" ability from the structure.
The robo facility has an ability called "robotics facility - train (robotics facility).
Go to that ability and go to ability info. Here you can set up all the units you want to train from a structure which has that ability. simply go to the reaver and change it to the colossus. you can also change the button at the top. this isnt necessary, but you need to remember the name of the button.
Then go back to the robo and go to "command card". remove the reaver button and create a new button that has a colossus on it.
Command Type: "Ability Command".
Ability: "robotics facility - train (robotics facility)"
Ability Command: the name of the button.