Save your progress first
Choose Export, then Your progress, so the definitions, favourites and connections you refined in Work mode are in your files.
Change the theme names in the Data file
Themes come from the theme column. To rename a theme, change its name on every row. To merge two themes, give their rows the same theme name. To split a theme, give some of its rows a new theme name.
Tip: Names are matched as plain text, so check spelling and capitals on every row.
Move codes if you need to
To move a code into another theme, change the theme on that code's rows. A code's quotes move with it.
Update Framework and Connections
Change the matching names in the Framework file, so definitions still find their theme, and in the Connections file, so links still join the right ends. Write a definition for any new theme.
Load the files again
On Start a project, add the files to their slots. The map is drawn from the new structure.