How do I transfer/import Developer ID Application cert from one mac computer to another?

How to delete certificates from "Certificates, Identifiers & Profiles?" I have a new Mac and need to create new certificate for it but there is no option of deleting or editing of the existing certificates. When trying to add a new one the option is greyed out with the following commend: Developer ID Application This certificate is used to code sign your app for distribution outside of the Mac App Store. Maximum number of certificates generated.