How to split a package to have a -devel one?

[Nikolai <brkamikaze@xxxxxxxxx>]

I am creating a RPM to submit to FE, but it is a development library. Since it has some .so* files and some .h files; I think the package should be split into a simpler package, with the .so* files and a -devel package with the .h files. How can I do this?
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