Solution

Open CertMgr

2.  Select the "Intermediate Certification Authorities/Certificates" folder

3.  Select the CA you wish to remove, then select the "remove" X button

How to import an Issuing CA in Windows

1.  Open CertMgr
2.  Select the "intermediate Certification Authorities/Certificates" folder
3.  Right hand click on the "Certificates" folder and select "All Tasks" then "Import"