Created a discount coupon to apply to a product with the one-time use option

-- url of the page with the problem -- : ilvasapolli.it
-- HikaShop version -- : 5.0.3
-- HikaSerial version -- : 5.0.0
-- Joomla version -- : 4.4.2
-- PHP version -- : 8.1.27
-- Browser(s) name and version -- : Chrome

I want to create a discount coupon code (not in percentage, but in numbers) to apply only to a product to be used only once.
Sorry, but I really don't understand how to do it.

Sorry, the version of HikaSerial is 4.0.2

Sorry I explained myself badly. I created a coupon in Hikashop (screenshot1).
Now I would like to reproduce it in HikaSerial by uploading a csv of 1200 codes in order to create 1200 coupons with those codes.

You keep assuming I know how to do it. But if I knew how to do it I wouldn't have opened the ticket. Let's recap: I already have the code file in csv because I generated it separately for AWOCoupon that I used before with Virtuemart. Now we have moved on to Hikashop and HikaSerial. What I don't understand is how to turn them into discount coupons. If you could kindly explain to me step by step how to do it. If it should be done in HikaSerial or in HikaShop I don't know. That's why I opened the ticket. In the documentation I didn't find this tutorial or explanation of the process to obtain discount coupons by uploading a csv file.

I solved it. I reloaded AWOCoupon and I do it with that. Of course not providing the possibility of loading coupon codes in Hikashop is really...

You said "you can generate a huge quantity of HikaShop coupons (by duplicate on coupon template)" do you think I use the duplication of the coupon template to create 1200 discount coupons, obviously each with a different code?
We chose Hikashop and Hikaserial because we thought they worked better than Virtuemart for a site that only has 3 products, but we are regretting having done so.
We create and manage stores in Magento, Prestashop, Woocommerce and for small sites we used Virtuemart. We chose HikaShop because Virtuemart is now a disaster, but we are working harder to make this small site with 3 products work than the sites in Magento that have thousands. That's fine. We will use AWOCoupon.

Listen, the misunderstanding all started from the fact that I thought that you could create discount coupons in HikaSerial and then upload them as discount coupons in Hikashop.
Unfortunately, HikaSerial can only create codes to export in csv, but I already have those.
However, it is not possible to upload the csv in Hikashop and create the discount coupons that are in Hikashop.
This means that I would have had to create them one by one and there are 1200 of them.
Luckily, AWOCoupon is compatible with Hikashop and so I created them there. Since AWOCoupon allows you to create coupons by uploading them in csv.
My observation is that it is absurd that in Hikashop there is no similar system, because it is obvious that when you have to create so many discount coupons one by one it is a huge waste of time.
Having said that, you deal with HikaSerial so we continued to talk about different things.
It's not a problem as I managed to solve it with AWOCoupon.

Thank you, I appreciate your effort. I will use AWOCoupon for now. Regards.