Hi Pushkar,
You will be able to create an extension at the
customer,
campaign, or
ad group levels and also set the targeting options. You will need to ensure that the targeting options set at different levels will not have an impact on the other entities. The targeting options will be combined with the ExtensionSetting properties to select which extension feed items will be used for a given impression. Please refer to
this guide for more information. Please let me know if you have any other questions.
Thanks,
Bharani, Google Ads API Team

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