You can export and import global enumerations. I'm not sure what happens if the enumeration already exists:
Create(DefinitionExporter.xml) for a Global Enumeration:
<?xml version="1.0"?>
<!DOCTYPE NmLoader SYSTEM "standardX20.dtd">
<NmLoader>
<csvExportDefinition handler="com.ptc.core.lwc.server.TypeDefinitionExporter.beginExportDefinition">
<csvtoLocation>D:\</csvtoLocation>
<csvtoFileName>enumeration.xml</csvtoFileName>
<csvexportDefClass>com.ptc.core.lwc.server.LWCEnumerationDefinition</csvexportDefClass>
<csvexportNames>EnumInternalName</csvexportNames>
</csvExportDefinition>
</NmLoader>
<csvexportDefClass>com.ptc.core.lwc.server.LWCEnumerationDefinition</csvexportDefClass>
<csvexportNames>EnumInternalName</csvexportNames>
</csvExportDefinition>
</NmLoader>
And import it again:
windchill wt.load.LoadFromFile -d d:\DefinitionExporter.xml -u wcadmin -p Manager