just bought an maudio oxygen8 v2 and i need some help with saving some settings ive got as far as mapping out my first synth which was the subtractor but when i create a new synth and start mapping the controls it wants to remove the ones for the first module to create the new ones,, is there a way u can save each synths controls once u have mapped them out i hope ive explained what i mean properly as im very new to this and have both reason and midi controller manuels i just dont know what im looking for....please help....

If you want to control mutliple and different devices in Reason, don't use "Remote Override"! Remote overrides are stored only for exactly that one device and you'd have to set em up for every new device. Search for Reason presets or program the default MIDI implementations (see Reason manual) as presets into your oxygen (see oxygen manual).

I had a similar issue and found that saving my presets either in a combinator or as an instrument work very well. It occasionally gets on my nerves if I want to use the "create instrument" button, but all in all works pretty well.