You can use the numbered list feature in Word to add numbers to cells in a table.
Note: If a table cell contains multiple lines of text, Word numbers each line in the cell.
Select the table cells that you want to number.
To number the beginning of each row, select only the first column in the table by clicking the column's top border.
On the Home tab, in the Paragraph group, click Numbering.
Note: To select a different number format, right-click a number in the list, point to Numbering, click Define New Number Format, and then select the options that you want.