If you want to use single certificate for both umcserver.ssl and sss.ssl certificates.
DCS 6.7 and above
If you are following steps mentioned in KB :
https://knowledge.broadcom.com/external/article/163766/how-to-use-a-3rd-party-ca-certificate-in.html
https://help.symantec.com/cs/DCS6.7/DCS6_7/v119681256_v110163010/Deploying-a-trusted-CA-certificate?locale=EN_US
For creating and using third party certificates then to use single certificate, follow the below mentioned steps :
1. SKIP the steps mentioned in section "To generate SSS.SSL keystore"
2. Update connector "SSS-Console-Service" and set path of umcserver.ssl for attribute "keystoreFile" in server.xml file present in tomcat conf directory.
3. Restart DCS Manager server services.