I understand you want to trace the path of a signal back to its origin(s).
If you are using the highlight function, try setting the 'TraceAll' parameter to 'on' when you run the highlight command.
Here's an example from the documentation:
In this example, you open the van der Pol Equation model, and highlight the signal path from Output Port 1 back to its sources.
open_system('vdp')
G = sltrace('vdp/x1', 'Source','Port', 1, 'TraceAll','on');
highlight(G)
If you run this same example but omit setting 'TraceAll' to 'on' (as exemplified by the code below), only the path up to the previous block is highlighted.
open_system('vdp')
G = sltrace('vdp/x1', 'Source','Port', 1);
highlight(G)
Here's the documentation for this example:
Alternatively, if you don't need this to be done programmatically, have you tried the Highlight Signal to Source feature? If not, right-click the signal whose path you want to trace back to the source, and in the context menu, select Highlight Signal to Source. Press CTRL+Left Arrow to highlight all source branches. See the documentation for more information:
