Quadtuplet

How do you create a quadtuplet? Time Sig. 3/4. Tuplets in Treble and Base clefs do not line up. I cannot find a way to have 3+3+4 above 3+3+3. Are polyrhythms not possible? i THINK I just cannot find the right way to do it. I have spent two days trying. I did watch tutorials but nothing on quadtuplets. Much of my music is polyrhythm. I sure would like to find a way to do this.Thanks in advance,Clif