This package has no agent interface.
To use this functionality on External Interface:
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Create two tickets on the agent interface.
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Choose the same customer user for both tickets.
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Link one ticket to the other one.
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Create a knowledge base article. Make sure that the knowledge base article is visible to customers or public. Just knowledge base articles of this type can be displayed in the external interface.
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Link the knowledge base article to the ticket created for the customer user.