I have a particle layer with arrows moving down to indicate flow in a pipe. The pipe has a valve and when the valve closes the arrows dis/re-appear at various times during a looping animation. This is working fine in 2 particle layers that I created from scratch. The dis/re-appear occurs differently for each of the layers.
The pipe makes a 90 degree turn. I'd now like to to copy a particle layer and rotate it 90 degrees shorten the length of travel of the arrows and have the arrows come on and off just as the layer they were copied from.
The trouble i'm having is that I can't seem to find a "Select all" meaning some way to select the entire layer, timepoints, visible and invisible an all other settings, and rotate it 90 degrees. (I'm just thinking now that maybe I enclose each layer in a group. ( parts of brain only engage when your talking))
I've gone to time zero and tried selecting, particle layer and the vector layer, all the keyframes. But what always seems to happen is the it acts as if I've just selected one key frame and the arrows move all over the place.
Let's call all the elements of the particle the "Particle Object" ( if Anime has a better name let me know).
My question is: How to duplicate the Particle Object(group

(If my group layer idea is the right one, maybe responses can help with other cool things re particles. (You need an expert when you don't now the question to ask so please answer any questions I haven't asked.))