1. Can more than one evoucher be stacked to purchase a single reservation , assuming that all vouchers were issued to the person(s) whose name(s) are on the new reservation?

2. Can I use an evoucher to book a trip prior to the expiration date of the evoucher, but for a trip that will begin after the expiration date? And if so, what happens if I then cancel the new reservation? Is the value of the evoucher lost, or does the issuance of the ticket reset the clock, and I will get a new evoucher with a new expiration date?

Thanks in advance for any info you can provide.