Is it possible to set/reset the 30 sec Timeline Markers to 0 sec?
I saved over an existing file to start working on a new scene. Adjusted the poses and positioned the same characters while also setup the camera, lights and environment to how I would like them for the scene to render. There's a chair that's dForce and would like to use it as I have not run the animation timeline yet for deformity.
When the Timeline is enabled the orange and black markers are at position 30 seconds, see T1 attachment, I deleted black markers or the yellow marker is manually moved the 0 secs, the characters poses and everything else is changed back to the previous saved file poses and positions before the file was overwritten/save as.
How are the 30 secs markers retained but changed to 0 secs, so poses and positions are kept and don't change? Is this even possible to do?
I hope I described the issue correctly.
Thank you in advance for your replies.

Comments
Save a single frame pose on the frame with the keys, then aply it (in frame zero) after removing the keys/clearing the animation data.
If I understand correctly. I save the two characters poses at frame 30 as Pose Presets?
Then delete frame 30 keys?
Do I use the hamburger (top right of timeline) to clear animation or clear near simulate(green button)?
The frame 0 keys that are the characters keys are selected and apply the pose presets?
I was mucking around yesterday and noticed an anomaly. When the main key(orange) is moved back from frame 30 to frame 0 to apply the poses and play is pressed, it runs the animation in reverse from frame 30 to 0.
The Orange is not a key, it's the current frame marker (the playhead). Any method for clearing animation should work, but make sure that the keys are gone.