Hi karnan sekar,
1. You could implement this for each RadEditor in Sitefinity after mapping the external template for the desired view(How to map a template)
2. We need to filter latest 1 item from each category (Group news). Please tell us how to build using sitefinity API.
We do not persist data about the last item that has been categorized. You could override the Save method of Edit and Insert views of your module, create a custom table where you store the content ID and metatag - "Category" and the date when the item has been categorized. In your code you need to check whether the Category has been updated when the content is being saved and replace the value and DateTime in your custom table.
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