Steps to convert a list of numbers to barcode font in Excel:

1. Download and install a barcode font on your computer.
2. Select the column of numbers that you want to convert to barcode font.
3. Right-click on the selected column and choose "Format Cells" from the context menu.
4. In the Format Cells dialog box, select the "Font" tab and choose the barcode font that you installed from the list of available fonts.
5. Click "OK" to close the Format Cells dialog box.
6. To create a second column that automatically converts the first column to barcode font, use the following formula in the first cell of the second column:
   Formula:

   =CONCATENATE("*",A1,"*") 

7. Copy the formula down to the rest of the cells in the second column.

The formula adds an asterisk before and after each number in the first column, which is necessary for the barcode font to work properly. Each cell in the second column should now display the corresponding number from the first column in barcode font.