Not sure what you mean by this. Do you only want APPLE and DELL to show in the graph, or only have a lable on the APPLE and DELL bars, but still see bars for the others?
I think you can do it via an if statement: If (COMPANY='APPLE' OR COMPANY='DELL',COMPANY,'N/A').
If you put that in the lable statement it should only put lables for those 2. If you use a similar statement in the expression it will only show data for those 2.