Hi
yesterday i did a run of Leon B with no saves in under 2h which unlocked all 3 infinite weapons for me, but when i started a new run of Leon A the items werent in the box.
Does this mean i unlocked them only for that 1 save file (claire A) and i have to do it again on a new save file starting from Leon A to get them on all scenarios?

Yup, and in my opinion, the gatling gun just isnt worth it.

thank you. for a moment i thought it will be like unlocking hard difficulty. (working for all new game)
i doubt i will use any of them but i do want all the unlocks

Or just use the infinite ammo cheat;

Up, Up, Down, Down, Left, Right, Left, Right, Aim. Go into your Item Screen and press this combo. Boom infinite ammo for all weapons.

I think the weapons would be available in Clare A.

I think it works like this:

You do a run of Claire A and it unlocks Leon B (Rocket launcher + hard mode)
Then you would need to start a run of Claire A again and weapons were suppose to be in the box.

If you want special weapons in Leon A, you should do a run Leaon A, then Claire B and then Leaon A.

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That is indeed how it works especially in the Playstation-version,
In essence, each of the unlock is tied to the "alternative-timelines"
( with the Claire A -> Leon B being considerd the official canon timeline, even after the retconned-timeline ).

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After finish B and I unlock the infinite gat, sub-m, and rocket launcher will those be available in B once I beat A once more or is the rocket launcher the only infinite weapon in B?

There are 3 unlockable infinite weapons in the game.

Rocket Launcher (Any A Scenario - Ranking A or B - Under 2:30 hours)
Submachine Gun (Any B Scenario - Ranking A or B - Under 3:00 hours)
Gatling Gun (Any B Scenario - Ranking A or B - Under 2:30 hours - No Saves)

But here is where people struggle a bit to understand.

Every time you beat the game you are prompted to either make a new save file, overwrite or to just update the data. And this save is for the opposite scenario you just beat, meaning:

Beat Claire A to create/update Leon B.
Beat Leon B to create/update Claire A.
Beat Leon A to create/update Claire B.
Beat Claire B to create/update Leon A.

When you beat the game and successfully unlocked the weapons, you're just setting up flags for the opposite Scenario, e.g.

These are just examples!

A new game save file flags
INFINITE_ROCKET_LAUNCHER=FALSE
INFINITE_SMACHINE_GUN=FALSE
INFINITE_GATLING_GUN=FALSE

Leon B save file flags after beating Claire A, unlocking the rocket launcher
INFINITE_ROCKET_LAUNCHER=TRUE
INFINITE_SMACHINE_GUN=FALSE
INFINITE_GATLING_GUN=FALSE

So when you play Leon B you'll have an infinite rocket launcher. Be aware that by using any infinite weapon during the game will instantly drop your final ranking to B.

After playing this Leon B save file, you'll be prompted to make a new Claire A save file. The infinite weapons carry over save files, that's why you have to beat the game this many times.

Claire A save file after beating Leon B unlocking the other two weapons.
INFINITE_ROCKET_LAUNCHER=TRUE
INFINITE_SMACHINE_GUN=TRUE
INFINITE_GATLING_GUN=TRUE

Then after that, you'll have to beat this Claire A save file to carry over the other two weapons to the Leon B save file. Technically, you have to beat the game 6 times to unlock everything in every Scenario. At least 6 times, you can miss the Gatling Gun because you have to beat the game without saving for this one, so you might do multiple playthroughs, it depends on you.

Detailed steps:
1. Start a Claire A new game. (beat the game under 2:30 hours with an A or B Ranking)
2. Create a Leon B save file. (after beating Claire A)
3. Load Leon B save file. (beat the game under 2:30 hours with an A or B Ranking without saving)
4. Create a Claire A save file. (after beating Leon B)
5. Load previously created Claire A save file. (just beat the game)
6. Update Leon B save file. (after beating Claire A)

And it goes all the same for Leon A / Claire B.

That's basically it.