You could try to write the text in this cell with the same color as the background: this will "hide" the value of the cell. This could be a problem while sorting 'cause the attributes may not be moved together with the cell values (I don't know if this happens but can be tested easily). In case, you will have to adjust the individual cell attributes after sorting the table.
In order to skip the "hided" cells while editing the table (if necessary) you must set those cells as Indicator, so that the cursor doesn't remains on them.