If I understand your question here, you have a test case of some kind and want to be able to copy that test into another issue in Jira. Jira itself does not offer test management functionality out-of-the-box, however there are lots of 3rd party plugins to Jira that offer test execution functions, such as xray, zephyr, testrail, qmetry, synapseRT, and a lot more which can be found in our marketplace.
As we do not know which particular one you are using here, I cannot say for sure if how to do this or even if this is possible, as this is not a function that Jira provides directly. Perhaps if we can learn which plugin you are using here, then we can consult the documentation of that plugin to learn more here. It might also help to reach out to the specific vendor of that plugin for help here as they will know far more about the abilities and limitation of their plugin.
If you do not know what plugin/app is doing this, then you might want to have your Jira Admin consult the Manage Apps section within the administration menu of Jira. An admin can also follow Managing apps to see and manage the other apps that Jira is running with.
Let us know if you have any followup concerns here.
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