The List field lets people add as many rows as they need in one tidy spot, like listing every child they're signing up with name, age and swim level. Here's how to add one to your form.
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Add a list field to a form
Go to Content > Gravity Forms and open your form.
In the field list on the right, open Advanced Fields and click List.
Click the new field to open its settings and give it a label.
Check Enable multiple columns if you want more than one column, then type a name for each column.
For any column that should be a dropdown, click apply dropdown and enter the choices.
Click Save (or Update).
On your form, people fill in the first row and click the + to add another.