How do I import a workspace from one version of FrameMaker to another?
I finally found the file in which my settings are stored and copied it to the corresponding folder for my new version of FrameMaker.
Workspaces are saved in C:\Users\[username]\AppData\Roaming\Adobe\FrameMaker\[versionNumber]\WorkSpaces\[Structured/UnStructured]
There is a descriptive blog too by Adobe FM team at: Workspaces in FrameMaker 9 – TechComm Central by Adobe
[The one thing I would add is that if you are importing to FrameMaker 15, you need to move the custom saved files into the C:\Users\[USERNAME]\AppData\Roaming\Adobe\FrameMaker\13\WorkSpaces\UnStructured\WYSIWYGView\ folder. This is for Unstructured FrameMaker. Not sure about other types of settings. I realized that I needed to go one folder deeper in order for FrameMaker to pick up the workspace that I had saved in the older version.