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I have a MacBook retina late 2013 with 16 of ram in it I was wondering if I could upgrade it to 32 its the 2.8 ghz MacBook 2013.

NO. *If the 2.8 GHz Quad Core “Core i7” 3840QM processor was selected as a custom configuration of the entry-level ME664LL/A MacBook Pro “Core i7” 2.4 15-Inch (Early 2013, Retina Display), it will have 8 GB of RAM onboard. It could be upgraded at the time of purchase to 16 GB as a US$200 option, but it cannot be upgraded subsequently. https://everymac.com/systems/apple/macbo