Steps to exclude specific machine names from naming scheme while creating MCS catalog.

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Instructions

1. Create machine accounts in Active Directory that you want to exclude from MCS catalog machines.
2. Click "Create machine catalog" and specify the account naming scheme for the machines that will be created, using hash marks to indicate where sequential numbers or letters appear.

Note: MCS first checks the AD for the existing machine names and skips the one which exist.

 

Create machine catalog https://docs.citrix.com/en-us/citrix-virtual-apps-desktops-service/install-configure/machine-catalogs-create.html