When EEM policies are customized in an older WCC (WebUI) 11.4.x release and now its time to upgrade them to a working WebUI 12.x, export and import of such custom policies should suffice. This document covers the steps
Workload Automation Autosys 12.x
1) Backup custom WCC 11.4.x EEM policies using Step A of the top section of the document: How To Export and Import EEM Policies (using the GUI)
2) Copy the resulting file to the WebUI 12.x server using Step B of the same document above.
3) This effective would copy your custom 11.4.x policies and update them on the 12.x release
4) If needed, follow Step C of the same document.