Standard or bush forms are the options for shaping brugmansia.   A standard form may be obtained in two different ways.   The growing of a seedling is one way. Seedlings naturally grow into a standard tree form.   Another way is to take a side shoot cutting or bottom (from the base) which will be below the Y.  Choose a side shoot that is straight, strong, and woody.    Next follow the instructions for propagation from a cutting and place the side shoots in a gallon pot with well draining soil. Place in a shady area then water and then water only after the soil has dried on the top. The drying of the soil will help in aiding the roots to grow out while seeking water.