Hi,
There is no option to create a coupon which price increases by 10 euros every 100 euros.
If you create a coupon with a price of 10 euros, it will be 10 euros regardless of the amount of the order.
If you create a coupon with a percentage of 10%, then its amount will increase with the total amount of the order (10 euros for 100 euros, 20 euros for 200 euros, but also 35.06 euros for 350.58 euros).
A third potential option is to create several coupons (with different coupon codes) like that:
price of 10 euros and minimum price of 100 euros
price of 20 euros and minimum price of 200 euros
...etc...