New child entries can be added for the parent entry by clicking on the plus button in the title bar of the child form box. This will open the form ready for submitting.
Clicking on the child entry will take you to the detail page. The child entries will display a box in the sidebar for the parent entries and all the other child entries will be listed.
Setting Up the Parent-Child relationships
In the form settings section of the child form open the "Parent Forms" tab. Select the forms that will be parents to the form and update the settings.
Submitting a Child Form From a WordPress Page
Once you've set up the Parent-Child relationships you can also set up child forms embedded in WordPress pages to connect to a parent entry by adding the workflow_parent_entry_id parameter in the URL. For example: