I have two projects very similar, I copied one and gave it a new project name as I want to keep the original, I don't remember how I did it but now when ever open either one in editor they come up with two schematics. I did a lot of work on one last night, saved as normal but then found I had lost everything. Is there a guide somewhere on how to create and save schematics?
Thanks
Brand new interactions and interfaces. 
Easy to use and quick to get started. 
If you have saved both schematcs into the same project then did you check both of them for the changes you made? Just in case you worked on one but thought you had worked on the other?
Here is some guidance on project and file management:
First, create a new project to put the schematic in:
Document > New > Project
https://easyeda.com/Doc/Tutorial/introduction.htm#Projectconcept
Then create the new schematic:
Document > New > Schematic
and save it in the new project:
Then you can work on it, save it, modify the schematic description, delete it or clone (copy) it.
If you clone it, you can save it into the same or a different project with the same or a new name.