| source_id (required) | source field ID in the current config | Copies data from a field that’s external to the section group’s range to each section in the section group. The source ID to copy must be in a field array or section that is one level up in the hierarchy relative to the destination section. For example, in a sections group, copy from the base fields array. In a nested sections group, copy from the parent section group’s field array. |
