If you're talking about the groups that you can create INSIDE of a sketch, the answer is NO.
These sketch objects, such as groups, are are known ONLY to the sketch and only while you're working in the sketch. Once you leave the Sketch task or editor, you lose the ability to even detect, let alone control those sketch groups.
John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Digital Factory
Cypress, CA Siemens PLM: UG/NX Museum:
To an Engineer, the glass is twice as big as it needs to be.