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You can pattern them as you appeared to already have done from the screenshot. You can use curves to guide your pattern if its not a normal array in one direction. What way have you constructed the bumps so far? Somtimes it's better to do the pattern first and then cut away before creating the main shape, or maybe use some surfacing. Do you have the part which you could take a photo of and post or is this a part you're manufacturing?
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