I know there are billion threads on this topic but non specified the question that I had, as far as I could find. When it states to add the +4,+4,+4,+2,+0,-2 bonuses, is this an initial bonus or does it get added with every class level you add. For instance if I had 3 levels of fighter to an Orc, would it then gain +4,+4,+4,+2,+0,-2 to its abilities 3 times, or just once for the first level?
Your racial stat modfiers are not connected to level at all. It would be applied once.
You would only add the modifiers once, but you also only add the modifiers when adding PC class levels to creatures with racial HD.
An Orc, for example, doesn't have any racial HD, it's HD are determined solely by class levels.
An Ogre, on the other hand, had 4 racial HD. When adding levels of, say Fighter, to an Ogre, you would apply the aforementioned modifiers.
Also, the modifiers are: +4, +4, +2, +2, +0, -2.
Edit: An Orc with PC class levels would use the Elite Array for stats: 15 14 13 12 10 8. An Orc with only NPC class levels uses the Common Array: 13 12 11 10 9 8