# Update global node and link groups

The Update global node and link groups function is activated by selecting the Update global node and link groups item of the Network Menu, when a network is in Edit Mode.

The Update global node and link groups function works by updating the user created node- and link groups globally for all classes in the network, such that each class will consistently contain the same groups. This has the side-effect that when the network is later saved in the .net format, the node- and link groups of the top class will be consistent with the groups of all other classes.