Once you change the properties for a particular CICS® region, you should upload the new properties to the CICS BAC application on the mainframe host. Follow these steps
This opens a dialog box that lets you view the object and region being uploaded.
CICS BAC connects to the mainframe and uploads the properties. If you haven't already set up the host user ID and password, you will be asked to enter your user ID and password to complete the operation.