If you have already saved the older schematic into an earlier project folder that you created for it then all you have to do is to close that older schematic and then Then go to the **Document** (the blue folder) icon at top left of the top toolbar and select: > **New > Schematic** then: > **Save** This will open the **Save as a schematic** dialogue box. The **Save as a schematic** dialogue box prompts you to choose name for the schematic and a Project to save the new schematic into. You can choose a project from the drop down list. This list will inlcude you newly created Project. You can reopen you older schematic by clicking on the project folder containing it and then double clicking on the schematic file.

Check https://easyeda.com/Doc/Tutorial/introduction.htm#Projectconcept