Relate Records Within Current Worksheet
Sometimes, relationships exist within the same type of business object. For example:
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Employee relationships: Supervisor and subordinate relationships between employees. 
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Administrative divisions: Hierarchical relationships between provinces, cities, and counties. 
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Task management: Relationships between parent tasks and subtasks. 
Example 1
In a task worksheet, display the relationships between parent tasks and subtasks.

Example 2
In an employee worksheet, display the supervisor and subordinate relationships between employees.

How to relate records in the current worksheet 
Let’s take a closer look at Example 1:
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Add the [Relationship] control > New association > Select this application > Select this table.  
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After this step, the newly added "Relationship" control will split into two controls: Parent and Child.  
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Parent: Refers to the parent task. A task can only be related with one parent task, so the relationship quantity is single row. 
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Child: Refers to subtasks. A task can have multiple subtasks, so the relationship quantity is multiple row. 
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Configure the Parent and Child relationship fields: Set the title, display mode, display field, etc.  
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Save the form settings. 
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Add records to test.  
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Create an Org view to show the relationships between parent tasks and subtasks. Detailed configuration of the Org view 