Hi,
If you are talking about using the Feed Manager to display feeds created by the mojoPortal Blog,yes, this is available in mojoPortal 2.3.9.4 and later. To view the feed URL for a particular category, click the category on the Blog page and then from the Posts in Category page, copy the link URL from the RSS icon. You can then copy this URL to the Feed Manager.
HTH,
Joe D.