Extended Functions → Creating Triggers → About Triggers
Triggers can be set up so that they execute automatically or as specified by users. When used with transition types that automatically link items (Copy, Post, Subtask, and External Post), triggers can fire without any intervention. You can also create triggers that users manually activate when they create a link between two items.
Transition items that are selected as values in the primary relational field or in which a primary relational field is the selected value.
Transition items that have principal or subtask relationships.
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