AcDbTable::removeAllOverrides

Acad::ErrorStatus removeAllOverrides(
    int nRow, 
    int nCol
);

Removes all the overrides in cell, row, or column.

Returns Acad::eOk if successful; otherwise, returns an AutoCAD error status.

Parameters	Description
nRow	Input row index. Insert the value -1 if you are only concerned with a column.
nCol	Input column index. Insert the value -1 if you are only concerned with a row.