Hi @Jamesbond7, let’s use a dagger as an example, because it has +1 to Weapon Power, as per your example.
Sweet, we have a character with B4 Power and a +1 WP dagger now. So we need to calculate the IMS (weapon damage stats) for that dagger. IMS stands for Incidental, Mark, and Superb. Incidental damage is a weak/clumsy hit, Mark damage is a solid hit, and Superb is the kinda stuff that cuts jugular veins, lops off limbs, or KOs a dude.
STEP 1: ON THE CHARACTER SHEET
Cermujin the Old finds a beautiful dagger in a field of corpses. He decides to pocket it for later, and adds it to his inventory. The player flips to the Weapons & Armor section of Cermujin’s character sheet to record the Dagger’s IMS.
We’ll start with Mark. Mark = Character Power + Weapon Power (which is the 5 you were looking at above). We don’t roll it, we just note that Mark damage = B5.
Now Incidental damage = Mark /2, rounded up. So Incidental damage is a B3.
Superb damage is Mark + 1/2 Mark rounded down. So Superb is B7.
We now have our IMS for your character when they are wielding a dagger: I=B3, M=B5, S=B7. We’ll just fill in the last of the weapon stats because we’ll need ADD in a moment…
Pardon my handwriting 
STEP 2: DURING THE FIGHT!!!
Cermujin gets JUMPED by a mugger! He whips out his beautiful dagger and slashes! Unfortunately for the mugger, he didn’t know that Cermujin has a B5 KNIFE SKILL! Cermujin rolls 3 successes against Ob 1! It’s a hit!
But what kind? Cermujin wants to spend ALL of his successes on damage. 
But to determine how much damage he can do with his extra 2 successes (Ob 1 - 3 successes = 2 extra), he needs to refer to his ADD!
He’s in luck because Daggers are extremely precise. The lower a weapon’s ADD is, the more easy it is to deal the big hits. ADD is the number of extra successes that must be spent to increase from Incidental to Mark, and from Mark to Superb.
Meeting the Ob 1 automatically means a Incidental hit, so he can deal B3 damage, BUT, he can spend 1 extra success to increase that to a Mark (B5) or 2 extra successes to raise that to a Superb (B7). He spends ALL HIS EXTRA SUCCESSES to deal a B7 wound to his mugger!
B7 is a Midi wound for the Mugger! He immediately loses 2 Dice from ALL his stats and skills! Notice that if Cermujin had scored less successes, he would have done either a Light Wound (only -1D) or a Superficial wound (only +1 Ob to all tests). But because his Dagger’s ADD is so low, he could make 2 extra successes really count. This fight is pretty much over as soon as it began.
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