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All the changes you make are reflected in 2 places - Calculation Lines and Payment Calendar. For more information about general contract changes see attached video:
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https://www.youtube.com/watch?v=LPYMrWzxQNM&list=PLGrwYyCxmp1RjVv_gk7TzUZpOnhoOUDot&index=19
In this case, we are choosing the process of changing Principal Amount, which is described below:
Step n. 1
At the beginning, you must find the Contract, on which you want to change Principal Amount. On dashboard click on Active and choose the concretely Contract.
Step n. 2
Then you will see Financing Card. In part FH FA Lines Subform click on button Change Financial Parameters.
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Step n. 3
In shown wizard enter the new Principal Amount. In this place you can also change Service Amount, Insurance Amount and Residual Value.
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Note:
After realizing changes, it's necessary to update calculation through button called Calculation, which is situated in section Process. All of the changes you made will be reflected in the Calculator Lines and Payments Calendar.
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Follow up:
How to change financing period