Hidden reference
The Hidden Reference field is not visible on the live form. It is an internal field that can be used for a range of purposes:
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Automated numbering of form responses
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Field mapping for integrations
 
Field setup
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In the Form Fields panel (left-hand side), under Advanced Form Fields, drag the Hidden Reference field onto your form.
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Type the field name.
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If you want this field to be a static reference, enter the default value that will be used to populate the field.
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If you want it to be an incrementing reference (most commonly used), select the Automatically populate with incremental reference number checkbox. +_ NOTE: This number will override the default value if one is set.
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(Optional) Enter a prefix for the reference numbering.
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(Optional) Enter a starting number if you do not want the reference numbering to start from zero.
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Click Save & Close.