Create functionality to "Get pricing from main item" button.
In Pricing tab on Website item doctype, have 'Get pricing from main item' button.
Function of this button is **"1. Getting Price+Sale price from master item
Getting On sale pricing summary scheme
Overwrite website item pricing (in case of website item already have price/on sale pricing scheme)"**
Prerequisite
Objection:
In Pricing tab on Website item doctype, have 'Get pricing from main item' button. Function of this button is **"1. Getting Price+Sale price from master item