All certificates (codesign and ssl) can be managed with the application DigiCertUtil.exe.

When you buy a cert you often only get a cer file - and importing is no problem - but export it as pfx is not possible in std windows - use DigiCertUtil for this.

For developing you use localhost - to allow for chrome to bybpass the need for a valid certificate enter this into the browser for https / ssl:

chrome://flags/#allow-insecure-localhost