Standard fades and previous fades

I have a question regarding fades.

In the fades window of pro tools there is a checkbox where you can apply fades without correcting the leght of the existing ones.
How can I do this in Nuendo?

I stumbled in this while using my workflow:
I did some crossfades and fades while editing audio. I didn’t do fade ins or outs for everything at the beginning.
After I finished my editing I wanted to fade in / out the rest of material with standard fade ins / outs and crossfades.
The standard fades obviously changed all the fades.