1.) Duplicate Barracks - Train ability.
2.) Under the Ability: Info^ + field, double-click the next open train slot.
3.) Scroll down and find the Info^ - Unit^ field and add a value using one of the custom units you would like to be trained. Be sure to set the train time in the Info^ - Time^ field.
4.) Repeat steps 2 and 3 as necessary for each unit you would like to be able to train.
5.) Find your new barracks unit under the Unit tab. Under the Ability: Abilities + field, replace the Barracks - Train ability with the train ability you just created.
6.) Select the desired spot for the button you will be using in-game to create the unit under the Ability: Command Card + field. Click "Add Button..." (the green plus or right-click > "Add Button...") and select your desired button, be it a custom button you made or a default one.
7.) Set the Command Type to Ability, the Ability to the train ability, and Ability Command to the unit you would like to be trained.
8.) Repeat steps 6 and 7 as necessary for each unit you would like to be able to train.
If you want to keep the default units (e.g. marines, marauders, etc.), ensure that the buttons that are already there have the Ability and Ability Command fields set accordingly.
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Stuff like this is scary. Seems like this person had many dreams and passions that were shattered due to false promises and lack of simply basic real life resources. Although that being said. Working for Blizzard might not be as pleasant as it seems. They are likely to be very demanding of their workers. For me it would likely feel just like what it is: A job.