You assign a charge to a practitioner by going to their practitoner record under settings > setup > practitoners. Click 'View' against the practitioner you wish to assign to charges, then click on 'Practitioner Settings', then 'Charges'.
You can either set it to have the same charges at all locations or use different charges at different locations.
Clicking on 'Change' against either their first or follow-up appointment charge will allow you to select a new one from the list of available charges set up on the system
