hi team please let me know how can we achieve helper class functionality where common code can be written

Depends on where you want to use it. Spryker already has a few parts to place such functionality. In templates/views -> Widget or twig function (depends on the scope of your helper) To share code between Yves/Zed/Client -> Service Share access to a 3rd party API/Storage -> Client

in zed layer, if 2 modules needs to access same function, then how we can do that

Then the shared functionality is probably a separate module. Or one module provides the functionality, and the other one uses it by using the respective facade method. Really depends on the structure, a few examples: 1. Price calculation in cart & checkout -> calculation module (separate module), as how the calculation exactly works can change, but the cart & checkout will be the same, they just display other numbers then, and vice versa when the cart/checkout changes, the calculation does not need to change as well 2. Url & category urls -> slugifying rules will be needed in both, either when you update a url or a more specific category url, so category urls already depend on urls, and I would put the slugifying into the url module and either expose it via facade method or just allow to put in any url into the url module and do the slugifiying internally in the url module But this is a whole discipline to find the right boundaries and dependencies and pretty much depends on the current and future use cases.

ok thanks