Anchor Camera to a Keyframe?

Here’s my problem:

I have an animation and two cameras. The second camera cuts at Frame 10.
However, if I changed the duration of the animation to Frame 11. The second camera will be out of sync. I want the second camera to “anchor” to the original Frame 10, which is now Frame 11.

Is this possible? Or are there any other alternatives to this?

Thank you for looking at my problem.