Using a sublist allows providing a grid view of a related list anywhere inside your form. Related lists are lists that contain a lookup column to the list or library the current form is for. The sublist is editable and can be used on new, edit and display forms.
Available sublists are displayed as the options of Insert sublist custom action in the ribbon toolbar. Only lists or libraries are displayed with a lookup to the form’s list.
The view of the inserted sublist can be edited in the same way as an out-of-the-box list view web part (to change things like query, fields, etc.):
- Select the row on the list view
- Click Modify View on the List tab of the ribbon.
On new and edit forms the data edited in the sublist is only stored when the whole form is saved.
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