How to connect Groups together using arrows?

Question

Since I can't find a way to insert a node into another so the only way to express some nodes belong together is using Group Feature. But I want to present the relationship between these Groups using lines and arrows. Is there any way to do this?

Answer 1

To connect a group node to another node, move the mouse inside the group node but close to the group's border, press and hold the left mouse button, drag the mouse to the desired target node, and finally release the button. As with non-group nodes, the start node may not be selected for this to work. If the target node is a group node as well, the mouse has to be inside the group node and close to its border when you release the mouse button.