I have been doing some Citrix work with the new 4.0 product. I have run into a issue that you cannot create sites, the option is not there at all. It is caused by the .NET version 2 installed on the 2003 server. You can either remove the .NET version 2 or the below fix worked for me.
Create a file call “mmc.exe.config” in \Windows\system32 directory and add the following lines to the file. You should be able to create sites after this is completed.
<?xml version ="1.0"?>
<configuration>
<startup>
<requiredRuntime version="v1.1.4322"/>
<supportedRuntime version="v1.1.4322"/>
</startup>
</configuration>
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