Hello @Evans Karen
Welcome to the community.
Are you working with a board for a Company Managed project or a Team Managed project?
In a board for a Company Managed project, as Jonas said, the subtasks should show up if the parent story is on the board and the board filter doesn't exclude the subtasks.
If you are working with a board for a Team Managed project then subtasks do not show on the board unless you use the Group By Subtask option in the upper right corner.
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