Hello @Prasanna S Vanguri
Welcome to Atlassian Community!
I believe you are looking for a way to export your capacity report content (provided by JIRA Portfolio) to a CSV file. Is that correct?
Unfortunately, Jira Portfolio does not have this functionality at this moment, however, we understand it would be a useful feature. That being said, we create the following feature request to get it implemented:
Feel free to vote and watch the suggestion to increase its priority and also receive notifications about any updates.
Let me know if you have any questions.