function deleteRowsWithId(str) {
  for (y = Bottom; y >= 1; y--) {
    if ([1,y] == str) {
      DeleteRow(y);
    }
  }
}

for (y = Bottom; y >= 1; y--) {
  if ([7,y] == "B") {
    deleteRowsWithId([1,y]);
  }
}