Once the duplication process is complete, the suffix “_copy” will be added to your duplicated ad group’s name. When you duplicate ad groups and keywords within or across campaigns, any applicable audience refinements — such as device location, device type, or demographics — will be copied.
Note that if the combined size of your ad groups and keywords exceeds the data limit of 10,000 targeted and negative keywords, you may not see the option to duplicate both settings and keywords. Select fewer ad groups and try again.
Certain audience refinements may be dropped during the duplication process if they aren’t relevant to the destination campaign. For instance:
If your destination campaign is promoting a different app that doesn’t support the device type specified in the originating ad group.
If the original and destination campaigns are promoting different apps, the “New users” customer type won’t duplicate.