When I download static mesh groups from FB or Qunitell how do I separarte the static mesh. (ie a line of bottles, a group of props etc

Development Asset Creation
, ,
2

I believe this is what you need:

FAB Asset Packs only have 1 static mesh with all 200 meshes - Development / Asset Creation - Epic Developer Community Forums

If all else fails, you need to export to FBX and open in Blender to manually separate items (meshes).