Step-1: General tab
Now you are on general tab where you could give basic details about your discount rules.

Step-2:  Condition tab 

On condition tab, define your discount condition and click next. In our case, we wants the discount to be applied all products so choose All products to "Apply To" option.

Step-3: Discount tab

Now you are on discount tab where you could set the quantity range and discount type for your discount rule. If it is a fixed discount to all the quantities you can set up as Minimum range as 1 and the maximum range as 999.
If you are providing discount for only the first 10quantities, then the minimum quantity should be 1 and the Maximum should be 10.

Step-4: Front-end demo

Another scenario in which you want to set up the discount, for multiple quantity ranges.
Sometimes, the users purchase extra quantities of products when there are additional discount for additional quantities of products. So, the store owners themself want to sell more quantities as they need a good sale.

Here is the set up for multiple ranges:

For price discounts you can provide a price values selected in the adjustment type.
Similarly you can also provide product discounts store-wide.

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