We currently attach the revision triangles to our coasts in the following way.
In the hill we put <DIM> >TL-C> for revision C and we would like to be able to write in the triangle C1 but I don't know the method to do it, do you know the trick?
I went to tinker with the GTOL file. SYM (With Notepad it's good)
I just changed the TL-C symbol and it works (You have to restart sw )
You can see the folder, the file and the result in my images
Maybe you just have to modify the ones you never use
I haven't tried to create a new symbol by adding lines and I haven't tried to understand all the values that should correspond to dimensipons (triangle) and sizes (Text)