Import an intermediate CA
Intermediate CAs that are created outside DigiCert ONE® can be uploaded to your DigiCert ONE account, along with the roots and keys.
Export the intermediate CA and full chain, including the root and keys, in PKCS#12 or .pfx format.
In DigiCert ONE, in the Manager menu (top right), select DigiCert® CA Manager.
In the account menu (top right), select the account you want to add the intermediate CA to.
In the DigiCert® CA Manager menu, select Manage CAs > Intermediates.
Select Import intermediate CA.
Select the HSM provider and partition to save the keys to. (optional)
Enter the password for the exported intermediate CA file.
Select the exported intermediate CA file.
Select Next. The imported intermediate CA appears in the list.