Change exposure of multiple drawings

Hi all, I’m using harmony 14 on pc.
I did a prop of an Xmas light, basically a wire with 20 lights.
Each light is a separate drawing, but all of them come from the same source.
The source is a drawing with 8 substitution drawing (from 1-7 light with different colours, at sub-drawing 8 an empty drawing )
Now I need to swap all the 20 light to sub-drawing n.8 (the empty one)
I can do it by hand, but I wonder if there’s a quicker way to select the drawings and tell them to go to sub-drawing 8
any suggestion?
Thanks
Luca

Hi,
you could give a try to Harmony’s Sync Layers.
https://www.youtube.com/watch?v=PVUEdp-Ysf8
https://docs.toonboom.com/help/harmony-14/premium/timing/about-sync-layer.html