I have an SSL Certificate (letsencrypt.org) that is signed by -
issuer=/C=US/O=Let's Encrypt/CN=Let's Encrypt Authority X1
This cert is in turn signed by -
issuer=/O=Digital Signature Trust Co./CN=DST Root CA X3
I create a pkcs12 from the pem files using the following command
openssl pkcs12 -export -out cert.pfx -in cert.pem -inkey privkey.pem -certfile x3chain.pem -nodes
Where cert.pem is the certificate, privkey.pem is the private key and x3chain.pem is the issuing certificate (Let's En