Advanced File Configurator helps with the centralized management of configuration files. Using this feature, you can retrieve a configuration file from a specific device, customize it, upload it, and apply the changes to all clusters or a specific cluster.
Advanced File Configurator has rich set of feature and can be checked @ https://www.microfocus.com/documentation/access-manager/5.0/admin/advanced-file-configurator.html
This particular post can be use to make yourself familiar with this feature. It is using a very simple use case of changing the xmx (maximum memory allocation pool ) for IDP application. Check out the attached document to understand how simply and quickly it can be achieved using Advanced File Configurator.
Note: This document is a result of the learning process. I will highly recommend to read the official documentation.