Unless you get a full night from another member, you would need to do a once a year transfer from another member. If you are lacking just a few points, you can also purchase one time use points directly from DVC (once a year at 7 months out for $25 a point up to 24 points).
If you are short points to make a full night, you could not rent points from another member to make that full night. That would be a transfer.