Coupling discounts

Hi
Great plugin folks. I’ve got it set up to give a 20% discount to members on all events (sold via woocommerce).

Members had vouchers for 120, 70 and 50 as a thank you as well

What i want to do is have the 20% applied to all products bought UNLESS they use the £120 voucher. Then I want them to pay the original price minus the £120 (i.e. not get 20% off as well)

Is this do-able?

Thanks
Chris

https://wordpress.org/plugins/pricing-deals-for-woocommerce/