The answer is, yes.
The Enchant Christmas Bundle promo code is single use only. This means that all 1-10 General Admission tickets must be purchased at one time, in one transaction, if you would like the promo code to be applied to all tickets selected.
If you do try to apply the promo code to a second, separate transaction, the code will not process.
Please note, the Enchant Christmas Bundle promo code can only be applied to General Admission tickets. It will not be processed on VIP, Family 4 Pack, or group bookings.
You can purchase different ticket types (General Admission, VIP tickets, a Family 4 pack, Senior ticket, for example) in one single order, but the promo code can only be applied to the General Admission tickets you have selected.