Is it possible to draw the Guzheng playing technique in Dorico’s Playing technique? Like the one I can draw in Finale as I do not have image editing software to draw…
I don’t know what the Guzheng playing technique looks like (is there really only one? or are there in fact many?), but in general you cannot draw things directly in Dorico. Use an illustration program (e.g. Adobe Illustrator, or Affinity Designer, or even Inkscape, which is free) to create your drawing, export it an SVG, and then bring it into Dorico as a playing technique.