Remove item which on is multiple time in list

Remove item which on is multiple time in list

This is the item list of a module. Here is an item multiple times in list. I want to match item ID and rate if an item is found more than once then I will keep one item there and remove the rest. And the total quantity of all matched items that an item is placed before removing will be saved. If there is an item 3 times, I will leave one there and remove the remaining 2, the remaining 2 will be removed and their quantity will be added with this item which will be in the list. After that I will update the new list again with the data of that module. Is it possible to do this with deluge script? I have tried but I could't. I have attached an attachment of the data list here. I will be happy if someone helps.
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