panzer campaigns - bunkers

[CheerfullyInsane]

in scenarios like Normandy though this is not a viable option early on, try as i do, i cannot  secure Omaha at all, how do you approach dday on omaha

Ah, Omaha Beach.......
Well, that severely depends on which scenario and the optional rules in play.

Without Alt. Assault on it isn't too bad. It'll be bloody, but it can be done if by no other means than simply repeatedly throwing bodies at the bunkers. Don't be afraid to assault undisrupted defenders in the hope that they might disrupt. Eventually they will crumble.

With Alt. Assault on, it becomes much harder. Your best bet is to forego infantry reinforcements, and get all those AT-guns onto the beach.

The Alt_ scenarios with Alt. Assault on are, in my humble opinion, almost impossible.
The combination of anemic Hard Attack values, no Trench hex, and a 200% beach TEM almost ensures that Omaha will have to be rescued from outside.
Your best options are the same as always, heavy artillery and AT-guns, then pray to whatever deity you may have.
It won't work, but it's better than the alternatives.