Currently you cannot sort waypoints by date and time, but you can filter them into a folder using smart folders. You will need to receive all waypoints from your device. You can create a smart folder with criteria List="Recently read from device", Kind=Waypoint and Date within last <n> <days/weeks/months>. Note that to display device's waypoints in BaseCamp, they've already been transferred from the device, so the "receive all" will be virtually instantaneous. Hope this helps.
A better way in my opinion is to drag them from the GPS which mounts under my devices when you plug it into the USB port. You can select what you want and place them in the folders of your choice. The GPS memory will be in one volume and if you have a card it will be a second volume.
