The first step in setting up the “Nested Form Link” control is the foreign key definition in the entity associated with the form containing the link control.
The components are described below:
1. Attribute Definition:
The first step is to create an attribute of type UniqueIdentifier in an entity that is related to the original form.
To create an attribute, right-click on the name of the entity, then select the “New Attribute” option.
2. Relationship of two entities:
After defining the attribute, you must select the second entity (the entity associated with the current form) in the “System entities type” box.
To create a link, select the button 
first and then select the second waveform from the list in the communication form.
3. Save:
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After completing the steps above, select the Save button to save the changes.