Editing complex Tempo changes

I often have very complex Tempo tracks- Tempo changes every bar- sometimes twice per bar. Now say for example, I have 200 Tempo changes and I want to adjust Tempo change No 46- is there a way to adjust this Tempo without it adjusting everything that follows? It will always adjust the following Tempo to keep the shape of the rest of the song instead of simply moving everything on. Any ideas? Thank you!