I have a selection faces which needed to flip normals from my object.
Is it possible to save this. So these faces do not flip back again when using Ctrl+N. (Recalculate Normal)
Recalculating normals only affects the currently selected faces, just don’t select the ones you don’t want changing
You can save faces in a vertex group
Yes I know its not a big problem but sometimes I forget which faces where flipped.
Thanks for vertex tip.
Ctrl N will only influence the the normals (which is the derivation of the vectors making up the face). You might try “recalculate inside/ outside” as well. 
I hope that helps.