Building & using sub-forms

What a sub-form is

A sub-form is a repeatable group of fields nested inside a parent form — for example, "add another item inspected" within a single inspection form.

When to use one

Use a sub-form whenever the number of entries varies per submission, rather than building a fixed number of similar fields.

Each sub-form entry is saved as part of the parent record, so reporting on the parent form still includes all its sub-form entries.