Need help with Intersection command

Hello Forum, 

 

I am trying to create a mold using a part that was generated using the Intersection command. I drew the

real part I need. Closed the open end/area with a plane and then using the Intersection command came up

with a new part (yellow) that is the core pattern for my mold. I saved the core pattern as a part. Started new drawing to make a "box" around the core pattern so I can make a core box for casting a sand core. But for some reason I cannot

select the core part (Yellow) and make it disappear like I was able to do when I first started this project?

 

Is it possible to select an Intersection as a part? Is there some way I can save the intersection (yellow) 

part to another file as a solid or some other form so it does not show as an Intersection in my drawing tree

but as a real, self contained part?

 

Thanks,

Core shape created using intersectionNew core box lower sectionred and blue core box with core pattern yellow inside. Want to make yellow go away with the intersection command

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Thank you