You should tell them to evaluate at the ad group level. You should tell them to evaluate at the campaign level. You should tell them to evaluate at the keywords level. You should tell them to evaluate at the portfolio level. The correct answer is: You should tell them to evaluate at the portfolio level.
They should use custom formula and custom conversion. They should use custom dimension and custom formula. They should use custom formula and custom labels. They should use custom conversion and custom labels. The correct answer is: They should use custom formula and custom conversion.