See the topic Recalculate to learn about the Recalculate Options available when recalculating financials for Attendees.
You can use the Recalculate command for one or multiple Attendees in an Event.
You will find the command in the top ribbon of the Event Attendee edit form.
Figure 358: Recalculating One Attendee
You can also multi-select Attendees under the Event's Attendees tab, and access the command above the selection grid.
Figure 359: Recalculating Multiple Attendees