How can I merge two or more nodes/fields/supertags?

Use the command Merge node.

It also works on references i.e. it will merge the nodes referenced to and all references will be updated accordingly

To merge nodes

Select nodes, then run the command.

To merge fields

Get the field definitions in one place (copy/paste), select them and run the command:

To merge supertags

Get the supertag definitions in one place (copy/paste or @-mention), select them and run the command: