One Time Set-up Fee?

[hislordship]

Good morning

I have tried searching for an option to do this but not having much success.

We sell trophies, medals etc.
When a customer purchases trophies from us, they want to add engraving on the trophies.
Sometimes this includes a company logo.
I have set it up as an option to add engraving, which is added per trophy ordered.
But for the logo, we charge a one-off fee to set up the logo.
Is it possible to have this fee added somewhere?
This fee should be added ONCE, not per trophy.
Preferably it should be once only per shopping session, so if they order another different trophy it doesn't charge the fee again.

Any ideas are greatly appreciated and thank you for your time to help me with this.

[abantecart]

Welcome to AbanteCart!

You can create options for the product  (trophies) with engraving. You can option test type for engraving and file type for logo.
yes, you can add upcharge for options, just set the additional price you will charge 

Check this manual
https://abantecart.atlassian.net/wiki/spaces/AD/pages/10125381/Global+Attributes

For One Time  Set-up Fee, it is not currently possible. This needs to be custom programmed