In the option tab of abcreator, look in the bottom right of the panel.
It sounds like what you'd like to do will use Child Type: linked, then Child Entity: the ID of the officer unit. You'll put that option on the platoon unit, along with a second option to add the soldier.
On the options page of abcreator, click the ? in the top right to access the help for abcreator (then scroll down to "option tab", and click "described here").
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