I just cut and pasted the if/then from the manual. Didn't try it yet myself, but it looks complete.
Here's what's supposed to happen: transfer to the entity context (the entity that contains the option this is on), then, ask the question; does it have the tag runtime.child? (is this a child unit?) If no (=0) then run everything inside the if statement.
The cost will be in a cost script. Use the same if/then statement, and inside;
@single = 15
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