SR 5th ed. Applying blanket discounts to Cyberware

[Mathias]

Take a look at the biocompatability qualities - see how they make modifications to the stored essence multipliers?

You can use that same script - note that the phase & priority is important, and just change the grEssMult field to grCostMult to change cost instead of essence.

Then, create a new item on the Mechanics tab, and put your script there - all Mechanics are added to all characters, so the script will always run.