How can I define Issue ID and Parent ID before CSV import procedure?

[Fedor Trutsko]

This question is in reference to Atlassian Documentation: Importing data from CSV

How can I define Issue ID and Parent ID before CSV import procedure to avoid cases with duplicating of issues? 

I mean case when you are trying to upload issue with Issue Id which already exists in JIRA.

Thank you.

[Timothy]

Sure. You can define your own priority levels/value (https://confluence.atlassian.com/display/JIRA/Defining+Priority+Field+Values).