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It is not currently possible to export just one folder or one list. Sorry. You can export all of them to a CSV file and the use Excel or another spreadsheet program to delete the unwanted tasks.

Probably the most universal how-to question for GTD neophytes is this: How do I keep track of all the things that you're recommending I keep out of my head? What's the best tool? The answer is pretty simple: however you most effectively can create and review lists.

Many of the tools for personal organization miss the mark because they try too hard to simplify the complexity of our lives into forms and features. They often make our attempts at organization more difficult.

Allen's belief that appointments/meetings are not tasks, and are omitted from GTD consideration to be handled some other way.
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Many of the tasks I do are in preparation for, or a followup to, one of those meetings that don't exist in GTD.

Calendar
Reminders of actions you need to take fall into two categories: those about things that have to happen on a specific day or time, and those about things that just need to get done as soon as possible. Your calendar handles the first type of reminder. Three things go on your calendar:
• time-specific actions;
• day-specific actions; and
• day-specific information.

Time-Specific Actions This is a fancy name for appointments. Often the next action to be taken on a project is attending a meeting that has been set up to discuss it. Simply tracking that on the calendar is sufficient.

Day-Specific Actions
These are things that you need to do sometime on a certain day, but not necessarily at a specific time. Perhaps you told Mioko you would call her on Friday to check that the report you're sending her is OK. She won't have the report until Thursday, and she's leaving the country on Saturday, so Friday is the time window for taking the action—but anytime Friday will be fine. That should be tracked on the calendar for Friday but not tied to any particular time slot—it should just go on the day. It's useful to have a calendar on which you can note both time-specific and day-specific actions.

Day-Specific Information
The calendar is also the place to keep track of things you want to know about on specific days—not necessarily actions you'll have to take but rather information that may be useful on a certain date. This might include directions for appointments, activities that other people (family or staff) will be involved in then, or events of interest. It's also helpful to put short-term "tickler" information here, too, such as a reminder to call someone after the day they return from a vacation.
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The "Next Actions" List(s)
So where do all your action reminders go? On "Next Actions" lists, which, along with the calendar, are at the heart of daily action-management organization.

Any longer-than-two-minute, non-delegatable action you have identified needs to be tracked somewhere. "Call Jim Smith re budget meeting," "Phone Rachel and Laura's moms about sleepaway camp," and "Draft ideas re the annual sales conference" are all the kinds of action reminders that need to be kept in appropriate lists, or buckets, to be assessed as options for what we will do at any point in time.

If you have only twenty or thirty of these, it may be fine to keep them all on one list labeled "Next Actions," which you'll review whenever you have any free time. For most of us, however, the number is more likely to be fifty to 150. In that case it makes sense to subdivide your "Next Actions" list into categories, such as "Calls" to make when you're at a phone or "Project Head Questions" to be asked at your weekly briefing.

you can add both start-dates and start-times via Smart Quick Add. type /Dec 25 and the popup menu will give you the choice of adding that as a due-date or start-date.

The manual sorting would be just an additional sorting critéria. If I put manual sorting as first critéria then indeed, it will be the first one; If I put folder as first criteria and manual sorting as second one, then the manual sorting would be within each folder.

I want to save tasks by client name and functional category.