Hi!
If you have an existing Embedded Wizard project, then it will be very easy to port it to a new platform, due to the platform independent approach of Embedded Wizard.
If you want to re-implement your project with Embedded Wizard, then you should first implement the GUI application within Embedded Wizard, so that it is running within the Prototyper. Once this is done, you can generate the code for the STM32Fx platform.
If you are using a different display than the STM32F746 Discovery board provides (e.g. 800x480 instead of 480x272) then you need to adapt the LCD configuration and update. This is located within the file BoardConfig.c.
I hope this answers your question - otherwise, please let us know...