Hi Jyoti,
Thanks for posting your concern.
I am afraid that it is currently not possible to update the headline 3 of the expanded text ads. For now, you can only retrieve its data by using
getHeadlinePart3() method. Also, you can only create an expanded text ads with the headline 3 using its
ad builder.
As a workaround, you can use the
Bulk Upload as it could be used to create, edit or delete campaigns, ad groups, keywords and text ads. Furthermore, you can upload the bulk upload by using this
sample codes.
Let me know if you have questions with the provided suggestion.
Regards,
Ejay
Google Ads Scripts Team
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