Ok I have managed to use @Vasilios fast menu tutorial to create a new menu for the early evening and Lunch Menu
I have also set up the products using portions to make sure i correctly select the right item depending on which menu I am on
This is the only way that I have been able to do this and its probably all im capable of at this stage. Its great learning what is possible with SambaPos.
If anyone comes up with a better way then please let me know.