When you click Preliminary selection, the right portion of the Search Form will open and the left one will be deactivated. To return to the left portion, just click the Cancel button.
In the right portion of the window, you will see all parts within the interval that you selected in the left portion of the window or all parts linked to that supplier. If you have selected Sort by part, you will only see the supplier code in the left portion of the window and each delivery schedule will then contain all parts to each respective supplier.
When the right portion of the window is activated, you can also click Preview in the Window functions. The delivery schedule for the selected part or supplier code will then be "printed" on your screen.