Appointments+ additional fields macro

Alright, so now I enabled the additional fields add-on in Appointments+ and the 'appointments in product cart.' I want to have an additional field for 'desired location' that will show up in the product description in the cart. I tried putting the macro it created for emails: FIELD_DESIREDLOCATION, but it is just showing FIELD_DESIREDLOCATION instead of the actual value.

Also, is there a way to make that additional field a dropdown box with 5 preset values?

Please help. Thanks!