To help you use the word correctly, please provide more context:
* What did you mean to say? Was it "de-levelled", "de-leveled", "de-leveling", or something else entirely?
* What is the sentence about? The topic of the sentence will help determine the correct word and how to use it.
For example, if you're talking about a construction project, "de-levelled" might refer to the process of removing a level surface. If you're talking about a video game, "de-leveled" might refer to losing a level.
Once you clarify what you meant to say, I can help you construct a grammatically correct sentence.