Hello there :
i have problem maybe i cant describe it correctly so please check this GIF , i have a "chair model " and i want to make a curve in this model so when i select just one edge and move by “normal transformation” i get what i want but i want to speed this process and make it for loop edge "i want all edges to be moved individually in z direction " but i cant get it so how i achieve this .
I’m not sure if I understand correctly, but try to select the edge loop, a use Shrink/Fatten on it (it is in the right-click context menu in vertex mode). See the GIF.
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Man you are legend 
Thank you so much that what i want to know