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It's pretty straightforward. Take all active modifiers to the roll, positve and negative, and total them. If the final result would be greater than +1 or -1, simply apply it to the roll as +1 or -1. Some examples:
A Stygies VIII Sydonian Dragoon is targeted by an Ork Megatrakk Skrapjet's Wing Missile from more than 12" away. The Dragoon has two sources of -1 to hit - the Stygies VIII dogma (-1 to hit against shooting from more than 12" away) and the Dragoon's own Incense Cloud ability (-1 to hit against shooting attacks). The Skrapjet's Wing Missile has a bonus of +1 to hit against <Vehicle> targets (which the Dragoon is). No other modifiers are involved from stratagems or terrain, so totaling the modifiers gives an end result of -1 (-1 -1 = -2 +1 = -1). This is not greater than -1, so that is how it is applied.
Take the same example, except this time the Skrapjet's Rokkit Kannon is the weapon being fired. It has no bonus of +1 to hit, and is still subject to the stacked modifiers of the Dragoon, so we have a result of -2. This is greater than -1, so we instead only apply a -1 modifier to the roll.
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