2. In the pop-up format cell box, click the "Number" column and select "Custom" below;
3. The format is a number, so you can choose the following "0" as the type, and then fill in the text to be added before the number 0 in the box below the type. Here, add "unit price" and click OK in the lower right corner;
4. As shown in the figure below, the text has been successfully added to the front of the list.