Depending on the topic requirements, you need to set the value of the Drop-down list option for the B2:b15 area, as shown in the figure
Open the topic indicator file as shown in the picture
Select the "B2:b15" area, as shown in the figure
Open the top toolbar data, click Data validation, as shown in the figure
Click on "Data Validation", as shown in the picture
In the Setup interface, select "sequence" under "Allow (A)" Drop-down list, as shown in the figure
In the "Source (S)" In order to fill in the title of the choice of the value of the option, in English input method under the comma separated (special reminder: must be in English input bit to enter a comma), input complete Click Confirmation, as shown in the picture
Back to the table, you can see the effect! As shown in the picture
Attention matters
Be sure to enter a comma under the English input bit
Remember to save after the operation