Right, I drive the formats from Relations in the active part. So you cannot edit those (intentionally...) I added dwg_sfra (which is \dwg_sfra\ in the symbol) in my part relations but this is ignored. The symbol is in the format as a note (as discussed above).
The propagate shows up in parameters when editing symbols...
This is what got me...
What is the name of this kind of tangency display?
This was available in Cadkey and in Unigraphics NX. Seems a lost art. Do we have the option in Creo and I just missed it?