Help with PATCH operation

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Can anyone help me set up a patch operation properly. 
In that, I set it up and it "edits" a "resets" untouched data fields (inputs) to 0, instead of holding on to their values. 

Ideally I want to leave the untouched inputs holding their previous values unless and until they are written over. 

Lemme know if this is what PATCH is intended to do. 

Thanks, 
Prathyusha

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