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When creating a new event you always have the option of linking it to any of your open goals by clicking the link to goals button in the top action bar.
If you have created goal categories this button will become link to... and show a list of the available categories to choose from.
Clicking this button displays a popup containing all your open targets grouped within their goals and goal sets. This list is ordered by due date so that the goals due next (or most overdue) are shown at the top.
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