How do you write trills with many layers??

[Tobbeh99]

Ok so I started arranging a Yu-Gi-Oh! Dark Duel Stories song when I ran into a problem. How to write out trills if you got another layer in the same staff. Can you use the trill symbol(like showed in the spoiler) or do you need write them out manually??

Spoiler

[close]

[Pianist Da Sootopolis]

I believe so, yes.
If you look at Chopin's Grande Polonaise, Op. 22, for piano and orchestra, there's a double third trill at about 1:15 or so notated this way.