is it possible ?
It is possible. You would need a browse permission for the two projects and the Link Issues permission. Then you can create a link between two issues. You can find more info here:
https://confluence.atlassian.com/adminjiraserver073/configuring-issue-linking-861253998.html
As @Alexey Matveev wrote, you can link the issues, but you can't associate them as parent-subtask if they are in different projects.
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