11.3 Layer Groups
Layer groups are a new feature in GIMP 2.8, and the concept is still evolving.
To create a new layer group, click the corresponding button in the bottom of the Layers dialog or use Image: Layer > New Layer Group or Layers: right-click > New Layer Group.
The layer group appears just above the current layer and is initially empty. A good idea is to immediately give it a meaningful name. To add a layer to a group, click and drag it to the group in the layer stack. Do the same to move a layer out of its current group or to move an entire layer group around in the stack. You can also add a new layer to a layer group, using the corresponding button in the Layers dialog or the entry in the Layers menu. Click the small triangle to show ...