Axis systems vs axis within Geometrical Set

Hello,
I use Catia for preparing models for FEA so please excuse my limited experience.
I previously created some axis systems and they reside within the Geometrical Set.1; I have now reopened the Part Design to add a further axis system and it is created within the Axis Systems folder in the tree.
What determines where the Axis System is placed in the tree?
I presume that there is a 'mode' that I need to enter to create within the Geo Set?
I suspect that all Axis Systems would be better placed in the Axis Systems folder for my purpose of selecting these for FEA boundary conditions, is this correct?