ETC Congo Family v6.4.0 - Manual (Page 186)

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Importing multiple items
When you want to import multiple items, you do it in the exact same way as when importing
single items. The difference is in how you select which items to import.
Select the top node to import all items of the same kind, like Sequence, Presets, Groups
etc...
Hold SHIFT (keyboard) or SELECT and click to select a range of multiple items of the same
kind. Hold SELECT and use arrows in console.
Hold CTRL (keyboard) and click to select multiple items of the same kind in a random order.
This is only possible with mouse/trackball and keyboard.