By default, new folders in your FolderGrid do not inherit permissions from the parent folder. However there are use-cases where some users want new folders to inherit all of the permissions of the parent folder automatically. FolderGrid supports folder inheritance through a folder property named appropriately enough "Subfolders Inherit Permissions".
To configure any folder so that its subfolders will automatically inherit permissions (and permission inheritance as well), simply select the folder then open the Permission dialog from the right-click menu and check the "New Subfolder Copy These Permissions" checkbox.
Note: the permission inheritance from parent folder to child folder (sub folder) is a one-time event only occurring when the child folder is first created. Subsequent changes to the parent folder's permissions will not automatically be inherited by the child folder.