They do have seeds but they don't come true from seeds. Basal cuttings or division is the easiest way to propagate.

Here's a picture of a Coconut Lime I rooted last year. It bloomed when it was 4 weeks rooted...

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Here's a Razzmatazz I rooted last year...It came back this year and bloomed like crazy! All the cuttings I rooted returned this year.

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Is there a site where I can learn about Basal cuttings of cone flowers?

Search on the forum for it. I think I posted that info last year.