Export or save the chain
Certificate chain is represented in SecureBlackbox by TElX509CertificateChain class (it appeared in SecureBlackbox 5).
The chain doesn't have it's own methods for saving the certificates. To save the chain's certificates to some data stream, you need to create an instance of TElMemoryCertStorage class and then use it's ImportFrom() method to import the certificates from TElX509CertificateChain to TElMemoryCertStorage. After that you can export the certificate(s) as described in the corresponding how-to article.