text input field update based on another text input

 TextInput::make('payment_before_discount')
                ->prefix('$')
                ->live(true)
                ->reactive()
                ->default($this->paymentData['total_before_discounts']),
           
            TextInput::make('payment_amount')
                ->label('Net Payment Amount')
                ->disabled()
                ->prefix('$')
                ->live()
                ->reactive()