Select Move before to move a column before some other one in the GROUP BY sequence list. The column that will be moved is the one you have selected in the GROUP BY sequence list.

From the Move before cascaded menu, select the column you want the one you selected in the list to be moved before.

If there are no columns in the GROUP BY sequence list or one is not selected, Move before is not available. The cascaded menu choice that corresponds to the column you have selected in the list is always not available.