Hi @krishna3 ,
Welcome to our Nulab community!
Is it possible to combine multiple project filters and create a board?
Unfortunately, each project’s board currently only provides a view for that project, it cannot filter issues across multiple projects.
However, Backlog provides a way to filter/view issues across multiple projects, please refer to this post: How to find and filter issues in all/multiple projects
This way, you can create a report that combines multiple projects for your user. 