Add a function component
The Function component is a component that can perform simple calculations (addition and subtraction). When placed in a custom grid, it can use the responses from multiple numeric inputs to calculate the remainder or the sum.

Supported question types
The function component is only supported within a Custom Grid and will grab numeric responses from all applicable questions in a corresponding row or column.
Use one of the following question types:
- Spin Box
- Numeric Slider

Calculations
The Function component can calculate results from numeric questions horizontally or vertically within a custom grid.
