Use Add to Selection to add the new selection to the currently selected embroideries.
Add Designs to a Selection
Place several small embroideries on the work area.
Use Box Select
(or another selection tool) to select some of these designs.
Click Add to Selection
.
Using Box Select
, select some different embroideries.
The new selection is added to your old selection.
Shortcuts
Select, Home Tab:
Keys: Alt, H, AS