1. Make sure that you have selected the option to add Crown Molding to your desired product in the "Construction Options" section in the Product Prompts.
2. Go to "Modify Subassemblies" and choose "Show Subassembly Prompts." Then, select the crown molding subassembly.
3. Check the boxes labeled "Return Left" and "Return Right," which will allow you to extend the crown molding in either direction.
4. Double Click in the text box to measure the depth of the adjacent cabinets on the side where you want to extend the crown molding. (either "Adjacent Cab Depth for Left" or "Adjacent Cab Depth for Right"). For example, in the drawing below I will be measuring the depth of the Upper Cabinets on the left of the Tall Cabinet.
5. To determine the length of the extension, measure the distance from the end of the crown molding to the point where you want it to extend to by double clicking in the Extend Crown Molding text box.
6. Check the box labeled "Return Extended Crown Molding Left/Right," depending on which direction you want to extend the crown molding.
7. Make sure that the miter angles for the crown molding are set to 45 degrees or your desired angle.
8. Click "OK" to apply the changes and redraw the product.