I want to create a new project and need to customize the fields only to that project and don't want to enable the same fields to all other projects in the organization.
Welcome to the Atlassian Community!
Team-managed projects keep all their fields local to the project.
Company-managed projects have several configuration settings around field use - see https://confluence.atlassian.com/adminjiraserver/project-screens-schemes-and-fields-938847220.html
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