Hi Vinayak,
You can link issues from different projects using the "Issue Link". You must have permission to Browse (see) both projects and to link them.
https://confluence.atlassian.com/jiracoreserver073/linking-issues-861257339.html
You can link issues from different projects which are in different instances .
For that, you must link the instances, have permission to browse the projects and link them.
Read more here
https://confluence.atlassian.com/adminjiraserver/federating-jira-managing-multiple-instances-961257360.html
Cheers
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