Making some assembly parts into a subassembly

Hi,

I have been a long time user of Inventor.

I love their DEMOTE command which gathers as many parts in your assembly as you specify and combines them into a sub-assembly.

I'm sure Solidworks has a similar capability but I have not found any in my searches.

Would someone point me to it?

Thank You

Sammy

SolidworksAssemblies