If I understand your question correctly you want to "append" the domain name to an existing entry using bulk-edit. This is not possible. For something like that, I recommend you use our PowerShell cmdlets and build a script to update your document:
https://content.royalapplications.com/Help/RoyalTS/V5/index.html?scripting_gettingstarted.htm
Regards,
Stefan
Cory
Is it possible to bulk edit RDP connections to add in the FQDN for the environment?