Category Properties Retention

The keep_tasks option determines what happens when you assign an existing ticket to a different category:

If keep_tasks is not installed, existing properties and workflow tasks are removed from the ticket, and any properties or tasks associated with the new category are added.
If keep_tasks is installed, existing properties and tasks are retained on the ticket, and any properties or tasks associated with the new category are added.

Note: For detailed instructions on adding properties to a change or issue category and defining property validation rules, see the Online Help.