Someone may or may not have thought of this, and I haven't had time to try it yet, and I already know of several flaws. The main one being the other race players will see this...
So ork players, don't bite my head off if this is stupid or already tried and failed, I'm just trying to help a bit.
And other race players, just in case I've hit something useful, go away!!!
Here it is:
Settup. First find where they are going to attack your LPs or where they are building up a strongpoint. For this, use infiltrating grots or suicide squad (or both if you haven't got infiltrate!)
It is mainly for getting stubborn things out of a defended position, mainly marines, but it could be used against WS, but then again maybe not...
2 Stormboyz units. 1 Big mek + slugga unit. (all with nob leaders and as many orks as you can afford). Each squad gets some fightin' juice, then jumps / tellyports directly on their heads. This draws no fire as the get into cc, but they get shot loads whilst there, thus the importance of the FJ.
The Skip: Slugga squads armed with whatever, and with nob leaders run in without being shot (much) use more FJ if you have it. This ties up the defending units, and hopefully may break a few.
The Jump: Stormboyz use there remaining jump and use speed boost to get behind the enemy and harass any reinforcing squads, reatreating squads or danceing squads.
The defending troops get mullered, and any reinforcing squads won't have much backup too quickly, so you can either defeat them peicemeal or move back to secure the position somehow...
The flaws: Commander and Chaos Lord will own the attacking units, and break them too quickly. Maybe not a problem if you have enough PK nobs around. Just be careful your BM stays alive so he can join the stormboyz in the jump if needs be.
Vehicles can comein and wipe your green hides into the floor. Dreads will tie up and break YOUR OWN squads. If the slugga units have rokkits, they can join with the BM tankbustin kit and tank zappa to take one, perhaps 2 down. But 2 or more will own you.
There are probably a million other flaws, but thats my best thinking so far.
So again, don't bite my head off I'm trying to help...