We are partnering with a company and we want to use JIRA. Can we isolate what they can see without creating a separate instance of JIRA? Or is that necessary? We do not want our other projects to be viewable.
You can control what the see by using groups and project roles. Just don't give the default jira-users group or any other group with logon rights to anything. And don't use 'everyone' in permission schemes.
You need to create a separate permission scheme and assign that to a project / projects in which you want to work with the other company. Please refer to https://confluence.atlassian.com/display/JIRA/Managing+Project+Permissions to get detailed informations about that. Additionally you can define security levels if you want to hide specific actions within that project(s).
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