See Price Lists/Packages for setting these up.

Select the package required. All items of the package are update and may be edited as required.

The Finance screen will show the package as a single item, unless the package is set up as "non package pricing", in which case all lines of the package will show in the finance screen.

Double-click on the finance line to change the detail or total value.

If the total is changed and updated, the system will automatically adjust the first item in the list to balance.
This is typically a tuition item.
Alternatively, each line can be changed individually.
Statistically and financially, the system analyses the individual lines.