Create a query that selects the data you require from your table.
in the same query add the following column;
Stamp: IIf([amount]<=1000,1,IIf([amount] Between 1001 And 2000,2,IIf([amount] Between 2001 And 3000,3,IIf([amount] Between 3001 And 4000,4))))
Just keep going until you reach the end...