The benefits of using arrays, is that the cells are protected without going into the protection process.
The first cell contains the array formula.
To create an array you must use these keys Ctrl Shift Enter then Enter
1. Select a group of figures
2. Press =
3. Select eg: Group of Qty figures
4. Select eg: Group of amount figures
5. Press Ctrl Shift Enter, Press Enter
1. To delete all cells that are performing the array
2. Select the First cell which contains the formula
3. Press Delete