One voucher is equivalent to one ticket – regardless of ticket type. 

To redeem prepaid vouchers,

• Select “Pick Your Seats”
• Proceed to checkout
• Enter the coupon code “voucher25” and click Apply.  This will set the order to zero. 
• Turn over the  appropriate number of vouchers at the door when you attend the play.

If you do not wish to use a voucher for some of the tickets,   do not include them in the order using the voucher coupon code.  Create a separate order for those specific tickets.