Importing data to a subform?

Importing data to a subform?

I have a link to the old help page on sub form import/export  https://www.zoho.com/creator/help/forms/creating-subforms.html#Import_Subform_Data

Is there a new help document for import/export of subforms in Zoho 5?

I was hoping just exporting some dummy data as Excel from my report would produce an example of what my mutl-sheet Excel should look like for import ... but I just get the subform information inside a cell as comma separated info, no second sheet to help work out what to do.

Regards,

 Peter