I have an idea, don't know if it will work!!
Try using a sequence structure in doing this.
1. firstly, open the multisheet excel file and select from it the sheet that you want to copy.
2.Take that worksheet and save it in another temporary excel file with one worksheet (the one u just copied).
3. Now Open the excel file that you want to copy it to and then insert the worksheet you saved temporarily. 4. Delete the temporary excel file afterwards.
Make sure you close all the excel files that you open before you go to the next step.
As I said, this is just an idea, may not work but if you can open, write to, read from and modify excel worksheets then you should have no problems, it should work. Will try and attach something later if no one else helps.