There are a number of different approaches to this depending on whether you want to do a one-time import or retain a link between the content in MS Project and JIRA.
If all you want is to import once and stop updating MS Project then the easiest approach is to create a CSV file as explained here. https://confluence.atlassian.com/jira/importing-data-from-csv-185729516.html
However, if you want to retain a link then you need to consider a plugin. Here are some options.
There are other options that you may also want to research depending upon your exact requirements.
Badges are a great way to show off community activity, whether you’re a newbie or a Champion.Learn more
A picture tells a thousand words. And agility boards have just released their latest feature: cover images on issues – so now your board can tell a story at first glance. Upload attachmen...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs