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For detail information about bulk changes see attached video, where is described the process of making mass changes:
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https://www.youtube.com/watch?v=LPYMrWzxQNM&list=PLGrwYyCxmp1RjVv_gk7TzUZpOnhoOUDot&index=20
Note:
For making these changes successfully, you have to define the same parameters as the contract has. If not, you will see Error.
You have also ability to make these type of changes directly on concretely contract, see How to change financing period, How to change financing rate, How to change principal amount .