Adding new keywords to manual PPc ads

Is it possible to add new keywords search terms to already existing manual PPC campaigns?

If not presumably the best way would be to create a new ad campaign for the same product?

thank for your help

Kind Regards

Yes, it is possible. While in the campaign, click on “Keywords”, then “Create Keywords”, then “Provide your own keywords”

Don’t forget that you need to have the buy box for your campaign to be operational and unless you are FBA, you won’t have it for at least 90 days.

See the link for buy box eligibility.