Do you mean to mark a data series in Excel? Do you want to add the label name ABC to columns A 1 to A20? If yes, please do the following:

First, define the data columns that need to be marked with data (that is, select them with the left mouse button). Then enter the name of the tag to be added (such as ABC) in the address bar in the upper left corner of the Excel table (A 1 is displayed), and press Enter. At this point, the tag name (ABC) of the data column (A 1 to A20) is added.

I hope my answer is helpful to you. You can leave a message or communicate online if you have any questions!