I assume you mean “data definition” and not “data dictionary”.
As for copy and paste update, does the copy work?
When copying the data from excel(after you’ve populated the exclusion row with TRUE), only select the data rows, and not the header. Select all three columns when copying.
When pasting, make sure the first record is selected.
And worse case, just do it manually by selecting the checkbox field, press spacebar to toggle it, then the down arrow to go to the next row. Rinse and repeat.