That will be very easy.
you can:
1.Select the area first.
2.click Data->List->create list
3.If the area has already got title, you can tick 'my list has title already', if not you can specify one by yourself.
4. then, you make sure every line in your list has the fomula enter.
5. When you insert a new line in the list, the number in the formula will be updated automatically.
Please refer to the attached excel. Field 'TT' is the fomular/function. You can try to append a new line inside the list, the fomular will change by itself automatically. Excel_sample_1.zip(2.65 KB, 下载次数: 12)