Auto-fill, copy, or clear a field with logic

Beyond showing and hiding fields, logic rules can write to a field.

The three data actions

• Set a value — write a fixed value into the field when the conditions are met (e.g. set Priority to High when Issue type is Outage).
• Copy from another field — write another field's live answer into this one (e.g. copy Billing address into Shipping address).
• Clear the value — empty the field when the conditions are met (useful when an earlier answer changes and a previous entry no longer applies).

Add one

1. Select the target field.
2. Open its Logic section and add a Data action rule.
3. Choose Set, Copy, or Clear.
4. For Set, enter the value. For Copy, pick the source field.
5. Add the conditions (same rows as show/hide), combined with ALL / ANY.
6. Save.

Notes

• A field can't copy from itself.
• Data actions run as the respondent fills the form — the value updates live when a condition flips.