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Creating Duplicate set is the option

do you mean duplicating the ad set?

You'll be able to do that in the 'Reporting' section if you want to lookback results with different windows

Under the ad-set level settings, scroll down to Optimization and delivery. Click on show more options, and you should see Attribution settings just above the "When you get charged" section. Hope this helps?

@Pulak we can’t change it if the objective is Website Traffic?

@Mansi Peswani ad set

@Mansi Peswani I don't think we can change attribution settings when the objective is traffic - check out this link for more info