Yes, you will need to configure this based on your use case. If left empty, the spreadsheet data is stored as a JSON string in the parent form's database table. If a child form is selected, the data is stored as individual records in the child form with the parent form ID as foreign key.
For more specific guidance, please share what you're trying to achieve.
I suggest you to import the expense claim app into your Joget and refer the configuration.
Additionally you can also refer these:
1. Spreadsheet
2. Spreadsheet Cascading Drop-Down List
3. Form Grid
4. Load and Store Binder MultipleFormRow