Good morning

Online store for a trophy company (no current Zencart site)

Now we sell trophies that have engraving which is added per item purchased. Easy enough to set this up.
BUT if a customer wants their logo, we also charge a set-up fee for a logo to prepare it for engraving.
This is only charged once on an order, regardless of which items are purchased.

Does anyone have an idea how to do this?

There was a suggestion of using a gift wrap option, where adding a one time "gift wrap" charge could be made to do the same function.

Any ideas on how to implement this would be greatly appreciated!