You can set preferences for how tasks are synchronized as a part of the Setup Assistant.
Sync direction
Selects either one-way or two-way task synchronization.
My Mac calendar
Tasks associated with the logged in user will be synchronized with the selected Mac calendar. We recommend creating a new Mac calendar for NetSuite.
Sync tasks which are due after
Only sync task from NetSuite which are due after the specified date.
Filters
By default all tasks are synced. Configure filters to focus on a subset of tasks.
