If you have email address of your seed list in csv file, create an import workflow and insert the records in Seed addresses (nms:seedMember), and mention the folder as well.
And in delivery > To > seed addresses > Edit the dynamic condition >
Folder equals to <select the folder>
By selecting this folder, all the seed list will get targeted.
If you want to create a separate seed address folder for your campaign, you can import the seed list to the new seed address folder, and call the same in delivery.
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