I have create a custom module.

This module have a head fields and some row elements.

For the row element i have use a Submodule.

It works but i can't import or export datas for sub module

My Excel's file has X columns for head and Y columns for SubModule

So, a element with description ABC that has rows in Submodule like those:

Date           Description

01/01/18     First Des

05/01/18     Second Des

My file of data import it's like that:

DES      DATE       DESCRIPTION

ABC      01/01/18  First Des

ABC      05/01/18  SECOND DES

...........

In form import i can select only head's fields nad i can't select Submodule fields.

How can i insert data into Sub Module?

Thanks