How will you add rows and columns to an existing work sheet?

To add rows to an existing worksheet, right-click on the row number where you want the new row to appear and select "Insert" from the context menu. For adding columns, right-click on the column letter where you want the new column to be inserted and choose "Insert." You can also use the ribbon menu by selecting the "Home" tab, then clicking on "Insert" in the Cells group to add either rows or columns.