Brainstorming about Web Map features.

Manually select multiple items in the navigation view.

Select all the related items in the "main" group and their "main" related and so on...

Select the current item with all the items, related up to a certain level.

Select all the related items, not related to further items.

Select multiple items from a list or table.

Build a relation tree, the current item as the root, to allow to select the items.

Render all the related items in a network diagram and allow to select within.

General multi-select with Ctrl-Click to select all visible entities in edit mode.