To divide all the numbers in a table by 1,000 and display them rounded to the nearest 10,000, you can use the following steps:

1. Select the column or range of cells that contains the numbers you want to divide by 1,000.
2. Right-click on the selection and choose "Format Cells" from the context menu.
3. In the "Format Cells" dialog box, go to the "Number" tab.
4. In the "Category" list, choose "Custom".
5. In the "Type" field, enter the following format code: #,##0,"K"
6. Click "OK" to apply the format to the selected cells.

This format code will divide each number by 1,000 and display it rounded to the nearest 10,000, with a "K" suffix to indicate thousands. For example, the number 1,403,333 will be displayed as 140, while the number 2,333,999 will be displayed as 233.

If you want to apply this format to a whole table of data, you can select the entire table and follow the same steps. All the numbers in the table will be divided by 1,000 and displayed in the same format.