Vouchers in Bustle are made to be redeemed, and when at a $0 balance, they can then be archived. However, there are some circumstances where you might need to remove one that has been paid, such as after the voucher has expired.
To do this, you will need to create a new Item and add it to your menu.
Set the sales price of the item to be the amount you need to remove, or make it a miscellaneous price button so you can enter in the price manually.
Name it something like - "Voucher Expired"
Add the button to the menu, save. On the Bustle iPad till app go to Settings > press Sync Menu
Create a new order - add the "Voucher Expiry" button to it with the correct price needed to bring the voucher back to $0.
Assign the order to the Voucher to get it to a balance of $0.
Head to Accounts and Vouchers from Settings and and archive the Voucher.
Remove the Voucher Expired button from your menu and sync the menu on the Bustle Till app again.