How to define a product with fixed price for a specific number of units and then with a unit price?

Scope

How do I set a plan price with a fixed price for a specific range of units and then by unit price?

Solution

Let's take an example that if the units are between 1-10, you want to charge the customer $50, and for each extra unit (after 10) you want to charge $15/unit.

1. So for this, a "flat fee" plan for the first 10 users with a fixed price of $50 can be created.
2. Then, you can create an "addon" of "per unit"-based pricing, and define a $15 price per unit.

So in addition to that plan, the customer can add the addon and choose the number of units, and the customer will be charged accordingly.