You can import the artwork into job properties at any time. When you drag the artwork to the layout view, make sure that the die stations are selected so that the artwork can snap to the die. If individual die stations are detectable in the die file and if the artwork contains a spot color die line the same size as the target die station, the software can automatically snap the artwork to the die. The artwork snaps to the center of the die line or trim box depending on the setting under Snap Artwork to Die. Otherwise, you can manually align the artwork to the die.
Note: The artwork must be unlocked so that it can snap to the die.
The bleed offset is automatically generated when the artwork snaps to the die.