You can use a Transaction List by Supplier or Purchases by Supplier Detail reports to show how much money you spent for a given period. These reporting will tell you the total cash outflow for each supplier. You can sort by expense total to help prioritise which suppliers you have paid.
Here's how:
Go to Reports then select Transaction List by Supplier or Purchases by Supplier Detail.
Update the Report Period and the Select Run report.
Select Sort and choose to sort by total in ascending or descending order.
To learn more about reports and how manage your cash flow, see the following links below: