Home › Google Analytics Certification You can only apply a Custom Dimension to data that was collected after you created the dimension. By · Wednesday, April 12, 2017 You can only apply a Custom Dimension to data that was collected after you created the dimension. True False Correct answer is: False Google Analytics Certification GA Gaurav Arora, Digital Media Lead. 10+ years running paid media and tracking for brands in the USA, UK and Canada.