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See here an example of a Shared Revenue Scale Condition with it's related list of included conditions.
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This Commitment has a share revenue condition for Gamesite.com sales. It includes two conditions each for the full banner and two for the leaderboard. Up to the revenue goal of 99.999 € a certain discount is granted and when over this threshold, another discount will be applied. 
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Example of one sub-condition linking to the Shared Revenue record you see above.
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The total revenue applied will be added up in the first condition record until the 99.999 € revenue goal is reached. The total revenue applied for the second condition will still be 0 € until you have reached your 100.000 € revenue goal. After you have passed the total revenue goal the revenue of all matching items will be counted in total revenue applied.