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Uploading Documents through Visual force page

I have a Custom Opportunity (Master) and child obj which have picklist values of 10. I created VF page to upload documents by selecting the picklist values. when ever I upload file, then it is saving in opportunity obj. 
1.) while uploading: when we selecting the picklist value, then upload file and click "Save & New" button, the picklist value is showing the value instead of "none".
2.) suppose I uploaded 4 docs out of 10 docs, the picklist value should show only 6 docs which are not attached. it is showing all the picklist values.
do any one understood my requirement, if so could you plz help me in this req.
Thanks in advance.