Endless loop layer/object in Photoshop ?

Hmm I'm aware that I can make the animation loop during play by selecting those options, but that's not quite what I'm asking about.

sorry if this is confusing

So let's say you're making an animated movie on photoshop. And you want to have part of the animation continuously loop on its own without having to redraw or duplicate all the frames within the timeline. Is there a way to do that?

im not asking how to loop the entire timeline. Just part of it like a specific layer. Say it's a bunch grass moving in the wind and I don't want to redraw the grass moving everytime. What could I do to make the grass loop the same amount of frames continuously throughout the timeline?  Or is there just no shortcut to this and I have to convert the video layer into a smart object and fiddle with the .psb file instead?

Whoa! Lol somehow all of my main post got erased except for the last part! Strange. This is what I was asking:

is there a way to make an endlessly looping video layer/object in the animation timeline? I'm aware that you can convert a video layer into a smart object and then duplicate the frames to keep looping inside of the .psb, but that is a bit too manual for my liking. Is there a way to make the layer loop endlessly until I want it to stop in the timeline? As if I were to extend the layer as far as I wanted in the timeline so that it could loop for that exact amount of time. Hope that makes sense.