With a little help from our friends at SAS Technical Support I was able to get the certificate imported. Here are the instructions I was given that allowed me to successfully perform the import:
Edit the trustedcerts.pem file
Copy the two certificates that are labelled as 'SAS VIYA Root CA' & 'SAS VIYA Intermediate CA'
Copy just the two blocks like this, no comments, in the new file
-----BEGIN CERTIFICATE-----
<block of base-64 encoded text>
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
<block of base-64 encoded text>
-----END CERTIFICATE-----
Paste the two certificates into a new file and save as a .pem file As stated in the SDM panel's text about subject-issuer order with the root cert last, you need the intermediate cert block first, then the root cert block last.
Run the SAS Deployment Manager to import the certificate from the new .pem file
Now, off to create the authinfo file...
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