Scorelines in gable top drawings

Hi,

i'm working in gable top manufacturing and i would like to ask if someone can help me to know about the importance of some scorelines as it is pointed in the pic under.

Why some scorelines are short than aother?

The score lines are dependent on the packaging requirements of your customers' equipment.  If I recall correctly, the shorter score lines are for easy open tops for gable boards that do not have a spout.  If the gable board has the spout, then a full score across the top would be needed.