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I'm coming up with rules for a campaign similar to Battlefield 1's Operations Mode. Basically, we have two different maps, with an attacking and defending side. The Attacker has usually about 250 Attack Tickets and 3 battalions, and have to completely conquer the map before moving onto the next one. Every an attacker dies, one attack ticket is lost, and if all attack tickets are gone the battalion is lost, and they have to start again. If all 3 battalions are depleted, the attacker loses. How do you suppose I can go about doing this in 40k?

EDIT: It's the attack ticket system that I'm talking about, not the general Operations mode. So far, I have that "Operationes" is abased off the Running Campaign, so we have four or five tables or so for each map, with each zone being a board, the objectives being, well, objectives.

There Isn't really any easy way to do it.

If I were to make any suggestions, it would be this:

Set out the board 6" by 4", and play from the short edges of the board. Each 2" by 4" is a sector. the Attacker deploys from the board edge and moves on with his movement. the defender can deploy anywhere on any of the 4" by 4" back boards or 6" on the foremost board. on each 2" by 4" sector, the opponent must place 2 objectives at least 24" away from each other 6 inches from their deployment zone. if you capture and hold these uncontested during the end phase of one of your opponents turns. you take the sector. and must now move to take the next sector.

Your army can change during each battalion change. Your opponent keeps the same list, but all of his infantry forces come back when destroyed in his next turn, vehicles and monstrous creatures 2 turns and gargantuan creatures and super heavies 3 turns.

the key thing to note is that the defenders end of the sector is their board edge and moves back as the attacker takes ground.

I'll add in more when I have had chance to throw together a bit of a schematic to demonstrate.

"Additions"

Each time the attacker is forced to use a new battalion, the defender may make a free move with all of his units to represent them hunkering down and preparing for a fresh assault.

Not entirely sure what you're describing, having not played Battlefield 1 I'm speculating (based on your description and a Battlefront 2 mode).

Short/simple version: set up a campaign map with two sides in control of some set of zones. One side gets to start as the attacker, they pick a zone to attack, if they win the game the zone changes hands. Separately keep track of the kill points scored in the match, if the attacker takes too many casualties (as a percentage of the army rather than a raw number, say if the attacker is depleted below half strength) he's become 'exhausted', has to stop to wait on reinforcements, and the initiative changes hands (the defender becomes the attacker, attacker becomes the defender).

If you wanted to make it more elaborate you could give advantages/disadvantages for controlling zones (rerolls, more reliable reserves, random artillery bombardments, fortifications, etc...), upsides to the defender as they get pushed back towards their home base (more points as high command sees the line breaking and shoves reserves in to plug the breach, home-ground terrain advantage, backs-against-the-wall morale, that sort of thing), or any number of other things.