I'm trying to create a list of epics and sub-task for the epic using the JIRA import sheet (Excel sheet) - I'm using the "Project Tasks" sheet to fill in my contents.
It is not immediately clear from your post if you are on Jira Cloud or Jira Server, but most of your questions are answered in the CSV import documentation you can find here:
As far as the relation between Epics and sub-tasks goes: that issues are being created as Issues in Epics is the normal issue hierarchy in Jira.
The maximum level op depth you create with issues in Jira is like this:
--> Stories, Tasks, Bugs, ... (Standard Issue Types)
In other words, sub-tasks belong to stories, tasks or bugs and are usually not related directly to Epics.
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events