How to add a fixed charge?

How can I add a fixed charge that is calculated based on quantity (once time)?
In addition to the standard price that changes with the amount, I need to be added a fixed cost.
for example: "setup charge". better if for each product tab

there are item which should be added only once, independently of the quantity. Example: setup costs or startup costs. As can I add these fixed costs?

But I have already set the shippijng methods (for delivery)

I try to explain with a practical example:

Product A Unit cost: 30,00
Q.ty 100 = 3000
Print setup (colour) = 25,00

Tot. 3000 + 25 = 3025 euro

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Product A Unit cost: 30,00
Q.ty 100 = 3000
Print setup (only black) = 15,00

Tot. 3000 + 15 = 3015 euro

As you see, I have two type of "print setup" and I don't set it in shipping cost, because changes depending on the selected setup but at the same time the cost is calculated once only and doesn't change based on the amount

How can I add a fixed cost as Print setup B/W and Print setup Colour??

I have the same requirement. I don't understand why this isn't part of the product as most other cart options have this.

Ok, that works. I added a product with a maximum of 1 per order