Creo Interactive Surface Design (Style) > Style Tree > To Select Entities in the Style Tree
  
To Select Entities in the Style Tree
You can use the mouse or the keyboard to select entities in the Style Tree.
Using the Mouse
Click an entity to select it.
To select multiple entities in the Style Tree, hold down the CTRL key while you click the entities.
To select a consecutive range of entities, select the first entity, hold down the SHIFT key, and select the last entity.
Using the Keyboard
1. Click the Style Tree window to activate it. A dotted rectangle appears around the top-level Style Tree entity.
2. Press the arrow keys to move the rectangle to other Style Tree entities.
3. When the rectangle is on the entity you that want to select, press the SPACE BAR.