I want to create custom Hub for my 4 applications where user can create request, view the request, work on assigned tasks , how can i do , please suggest me the possible approach

Create a custom Site as Hub with unified Record Type (for requests across 4 apps via relationships), Record List page (view/create), and Task Report interface (filter by app process models for assigned tasks/actions).
GO through this link for better understanding - https://docs.appian.com/suite/help/26.1/cp-13/sol-custom-suite-user-guide.html

Hi Shubham, Thanks for help!
but it would be more helpful if get more details or any example if we have.

Hi Shubham, Thanks for help!
but it would be more helpful if get more details or any example if we have.