Hi Bill,
RMS has the following tender types:
tenderOther = 0 tenderCash = 1 tenderCheck = 2 tenderCreditCard = 3 TenderAccount = 4 tenderFoodStamp = 6 tenderECCashCard = 7 tenderVoucher = 8 tenderDebitCard = 9
In your situation, the "$100 gift certificate" now effectively becomes a discount coupon, which is a form of promotional offer and entitles the bearer free gifts, similar to a discount on purchase or zero purchase. A discount coupon often does not have a serial number. It is a sales expense on the balance sheet. Tender type "Other" is probably the closest you can get.
So back to your question: Is there a way that a store manager can issue a gift certificate to a customer without actually selling it? Technically, if you give out any redeemable coupon (w/o selling it), it may be viewed as a discount.
Sale of Gift Card, Gift Voucher, or Gift Certificate becomes unearned income; a liability on the balance sheet waiting to be redeemed. It is only when the GC is redeemed is a sale realized or when it expires, in which case you would need to book it as misc. income rather than income from sale.
GC usually has a serial number or reference number on it for internal tracking purposes because companies need to know how much liability or worth of the gift cards they need to honor. I would assume your store policy should only allow generation/sale of a valid serial number when a payment is received from the customer.
I would be more concerned about the actual effect to the books rather than how you call your "gift certificate". Accounting principles should always be your guidance when selecting the correct tender type.