Hello Sir ,
I am a magento extension developer ,have experience in developing magento modules ,themes in both magento 1.8 and 1.9.I have created several modules and responsive themes .My best modules are Multi-Vendor Marketplace,Gift Cards,Ticket System .I have good knowledge in jquery and css.
You can have full faith in me ,I can do any kind of customization in both magento frontend or backend ,I have full understanding of magento database and its structure.
Steps For Task:
1: I will create a interface in magento admin which will have three items
a: browse button to upload csv
b: dropdown to select store
c:upload button
2: then I will create a controller that fetch the csv and read it line by line and explode the line with ,
3: then load the product collection and get store id and save the product in the collection
Waiting for your response.
Thanks