I need to know, how can I combine, two or more JIRA Instances from different's companies, into one, I need to conserve projects, accounts, users, etc, thank's.
I believe this 2 documentation pages will cover your issue:
Yes, these pages cover the issue.
The second document recommends using Configuration Manager for JIRA for migrating the projects' configuration, as it is required for importing the data. You can review this article for more details about the particular job - https://botronsoft.atlassian.net/wiki/display/CMJ/Move+Projects
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