What is the best way to edit an already designed horizontal alignment

Hello!

I am using BRT V08.11.07 but I am asking this here because I think the question is general and the InRoads comunity seems to me more active...

So:

I have a horizontal alignment already designed. I used in it almost all the horizontal features - Fixed and floating ones.

I discovedred that I have some constraints and I need to change some parts of it but others need to stay in place.

What's the best way to edit it?

I tried from Edit Horizontal alignment> Nudge but this option change also some elements defined by me as FIXED and not floating ... This is ruining me the entire alignment.