Use the Imaging and Configuration Designer (ICD) tool included in the Windows Assessment and Deployment Kit (ADK) for Windows 10 to create a provisioning package that applies a customized Start layout. By default, applying Start Layout customizations via Provisioning Packages will enforce the layout and prevent users from performing changes.After you use Group Policy to apply a customized Start layout on a computer or in a domain, you can update the layout simply by replacing the file that is specified in the Start Layout policy settings with a file with a newer timestamp.Use a file name of your choice - for example, Start Layout The Export-Start Layout cmdlet does not append the file name extension, and the policy settings require the extension.Applying a Start Layout through the Import-Start Layout cmdlet will not enforce the layout and users will have an option to perform changes.The file must be accessible on the local computer when a user signs in (the user must have Read-only access).If the file is not available, the Start screen layout is not deployed during that session, and the user can make changes to the Start screen.This feature is only available in Windows 10 version 1511.Applying a Start Layout using the "Only Specified Groups" parameter using Group Policy or provisioning packs will only lock the groups specified in the Start Layout xml.
You can specify a local path or a UNC path (for example, \File Server01\Start Layouts\Start Layout Marketing.xml).
The exported Start layout can then be deployed to all machines in the organization.
To prepare a Start layout for export, you simply customize the Start layout on a test computer.
So, you cannot select the computers on which you want to update the policy settings.
Second, you cannot specify individual settings to be processed.
Group Policy settings are applied when client computers restart or when the Group Policy refresh interval expires.