How to insert or delete a row, column, or an entire table in PowerPoint

1.  Select the cell next/back to which you want to add a row or column
2.  From the “Layout tab”, go to the “Rows & Columns group” 
and a few options will appear i.e.,
Insert Above (insert a new row above the selected cell)

Insert Below (insert a new row below the selected cell)

Insert left (insert a new column to the left of the select cell)

Insert Right (insert a new column to the right of the selected cell)

4.  pick your desired insert option

How to delete a row, column, or a whole table in PowerPoint

1. Select the row/s or column/s you want to delete
2.  From the “Layout tab”, click the “Delete” Command in the “Rows & Columns” group
3.  A  drop-down menu will appear with a few delete options i.e.,
Delete Columns (Click this option if you want to delete your selected column)

Delete Rows (To delete your selected rows, click this option)

Delete Table (to delete an entire table, click this option)

Method 2:
1.  By right-clicking on a table, a dropdown menu will appear
2.   From the dropdown menu, select the “Insert” and “Delete” buttons on the top tab to insert or delete row/s or column/s in PowerPoint
Method 3:
To Delete a table, click the edges of the table and Press the “Backspace”, or “Delete” button on your keyboard