Go into your grid question and select the Rows tab.
Select all row members together from your Row list and click on the Edit button.
A new window will be displayed which provides a bunch of settings.
The Row/Column Question Type should be "Select". Now click on the "Check Box (multiple response)" option.
Enter your Check Box Settings.
Now go to the Columns tab. Click on the codes you want to make exclusive (code 4 as per your request).
And that's it.