A group is created by pressing ⌘+G (CTRL+G on Windows) while one or more blocks are selected. Alternatively you can right click any block click "Group". To ungroup, press Shift+⌘+G.

Double-clicking on a group will open it so that the inner blocks can be edited. Once open you can select and group inner blocks to create a nested group.

Pro tips:

- Hold ⌘ and click on a grouped block to select it without having to open the group first.

- To add a block to an existing group, cut it out, open the group and paste it.