There are several places where you can actually accept and record the payment of an outstanding bill. Just select (highlight) the bill to be paid and then click here.
As in most other grid views, you have the option to Group and otherwise manipulate the data you are viewing.
In the above example, we have grouped the Hirer Names by dragging the Hirer's Name column to the group panel. We have also selected the "+" button to expand the information relating to one client.