How do I enable Differentiated Tags for an account?
You can enable Differentiation Tags setting at the account level or sub-account level. This setting can also be locked for sub-accounts.
Open Account

In Global Navigation, click the Admin link [1], then click the name of the account [2].
Open Settings

In Account Navigation, click the Settings link.
Enable Setting

In Account Settings, click the Differentiation Tags checkbox to enable the feature.
Note: The account setting will only display if the Differentiation Tags feature option is enabled.