When defining a new node by clicking ( Generate Node Type), it is important to model the nodes in a way that defines inputs and outputs correctly with respect to the intended use of the new node. It helps to visualize the new node as a bubble enclosing the set of existing nodes to become part of the new user-defined node. All associative links that cross this boundary become input parameters and all nodes that are contained within it are the outputs of the new node.

The assembly of nodes shown above is what will become the new user-defined node, which is commonly referred to as a component in GenerativeComponents.

Once the initial modeling is complete, you can create a new node type by clicking ( Generate Node Type).

The Graph turns gray.

A dialog opens in which you can define the node input and output parts.