Save AsKeyCreator \ File \ Save-As
The Save As command lets you create more than one version of a file. You can choose to save each version under a different name, or you can save the file under the same name in different directories or on different disks. This is useful when you want to keep a backup copy or when you want to have several versions of the same part so that you can compare modifications you've made.
Using the Function:
When a design file is saved, the system mode (Layout or Model) that was active when you saved it is saved as well. Additionally, whenever a design file is loaded, it will open in the mode that was active when it was last saved.