Fixing a part of a split FeatureManager in assembly

Hi guys,

in an assembly, I can split the creation tree feature manager in 2 half: 

Can I fix just the top part of it ?

What I want is always have My 3 bas planes on the top and a standard behaving feature manager on the bottom. 

I am aware of the "scroll selected item into view", but I can't deactivate it only for one half of the feature manager.

Any idea on how to achieve this ?

SolidworksGeneral