The only curative approach for lung cancer at the present time is local treatment for early disease. Local treatment is generally surgery or radiation. Surgery has been studied longer and hence constitutes the best available option. Radiation is generally recommended for patients who are deemed unfit / who are unlikely to tolerate surgery.
I am uncertain if the question is :
does it work to have part of the lung removed (in terms of obtaining cure)? if this was what you meant - the answer is definitely yes.
does it work to have part of the lung removed (in terms of maintaining sufficient lung power after the operation)?
the answer is: part of the planning is to assess the odds that removing the diseased lung will allow enough lung capacity for the patient to return to his previous lifestyle