By default, tasks deleted from the To Do List are moved to the Inactive Tasks tab and are no longer displayed in the Document Type tabs. After they are moved to the Inactive Tasks tab it is then possible to delete the tasks permanently from the Smart Instrumentation database.
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Click SmartPlant > To Do List.
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Select a Document Type tab.
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In the Document Type tab, select the tasks that you want to remove.
You can select all the tasks in the To Do List by pressing CTRL + A.
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On the To Do List toolbar, select Delete
.
The selected items are removed from the Document Type tab and moved to the Inactive Tasks tab, they have not yet been deleted from the database.
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Select on the Inactive Tasks tab.
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Expand the Deleted category.
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Select the tasks you want to permanently delete from the database.
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Select Delete.
Before the final deletion, you can return a deleted item to the To Do List by selecting
that item and selecting Restore 
.
When a Delete, Defer, Ignore, or Restore task is performed on an item within a hierarchy, the action is carried out on all
the items, both parent and child, within the hierarchy. For example;
A Delete task for "Create I/O Card" – the task for creating the parent slot, controller, other I/O cards, channels and control system tags under this controller are deleted as well and are moved to the Inactive Task tab.
If you now restore a channel back to status Create, all the hierarchy under the controller, I/O cards, channels, control system tags, and so forth are restored to their previous state.
When deleting, deferring, or setting a task to Ignore, related item tasks are not affected. For example;
A Delete task for "Create Loop" – the task for the related instrument is not affected. Running the Create Instrument task fails due to missing the related item (the loop).
A completed task in a hierarchy is moved to the Inactive Tasks tab even when some of its child items still have tasks to be completed. The uncompleted tasks remain in the To Do List and the parent items are displayed (in flat view and tree view) as a view only reminder that there are still child items that have tasks to be run before the item is complete. For example;
Create tasks exist for a controller, slot, I/O card, and eight channels, after running the Create task on the controller, slot, and I/O card, they are moved (after refresh) to the Completed section in the Inactive Tasks tab even though the channels were not created. The items that were higher in the hierarchy than the channels, in this case the controller, slot, and I/O card, are still displayed in the to the To Do List as a view only reminder that there are still outstanding tasks related to them.
Running the Create task on two of the channels, moves those channels to the Inactive Tasks tab but the reminder remains because there are still items (in the hierarchy) that have not been created.
Only after creating all the channels, the controller, slot, and I/O card are removed from the To Do List. They can still be found in the Completed section of the Inactive Tasks along with the newly created channels.