I am using the built-in python script template 'Custom Nodes' to create a custom node tree, and when I have finished most of the works and try to group my nodes, I find the menu item 'Group' is disabled.
Is there a minimal demo that supports the group operations?

selectfield toTrueto select it. Does this answer give you the sample you need? – Marty Fouts Feb 24 '22 at 14:50