In the upper portion of the Create tab you make your selections from the part register. In order to calculate the volume value of your entire range of parts, leave these fields empty.
In the lower portion of the window, you select which ABC code calculation you want to perform. Under Calculate volume value according to price alternative you select which price alternative for purchased and own manufactured parts you want to use when calculating the volume value. By using the ABC codes button, you can see and change the distribution. You can also select which part types you want to include in the list.