How we can divide our human resources in JIRA Projects?
Create working plane for them?
I'm not exactly sure what you mean. Take a look at our docs on project permissions, which I'm hoping will suffice your needs:
https://confluence.atlassian.com/display/Cloud/Project+Management
https://confluence.atlassian.com/display/Cloud/Managing+Project+Permissions
https://confluence.atlassian.com/display/Cloud/Managing+Project+Role+Membership
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