Using Bulk Clone, you can clone up to 100,000 issues at once. There are two ways to do so:

1. Bulk Clone using the Jira advanced issue search.

  • Filter the issues you want to Bulk Clone by using Jira Advanced Issue Search.

  • Click the Bulk Clone button.

  • Configure and create your Bulk Clone.

Bulk Clone button in Jira issue search

 2. Bulk Clone from the Deep Clone navigation

  • Next to the Create button, select Apps > Deep Clone

  • Click Bulk Clone in the Jira navigation on the left.  

  • Filter for all issues you want to bulk clone by JQL, a favorite filter or project

  • Configure and create your Bulk Clone

If the Bulk Clone button is not visible, expand the menu by clicking the expand arrow.

Bulk Clone in app menu
https://youtu.be/h1Mc1gwwT4E