How do I remove the Share property to a Sheet that I've saved as a back up?

How can  remove all references to a sheet?  Here's a summary of what I've tried.

• Sheet A is my Master on which I have many project tasks out to various resources.
• I made a backup of Sheet A and called it Sheet B.
• I then deleted a lot of tasks from Sheet A knowing that I had them saved in Sheet B.
• I removed sharing on Sheet B.  I don't want Sheet B referenced for anything.
• I create a report intending for it to draw only on Sheet A but yet it pulls from Sheet B as well.

What am I missing?

Thank you,

Holly.