Assembly layers managing

Hi alls,

Difficult for me to manage layers (curves) in big assemblies...

For about 10 years ago, perhaps more !

I'm making curves in parts but can't undertand how to handle them in a whole assemblies.

Curve propoerties are still gray.

I've made curves from section in a lot of part...

Impossible to move them in a layer such as "section_curves".

I know option "propergate status" but can't understand how to use it... 😉

Is there a tutorial or any explanation on how to do ?

Thanks