Im not sure im doing this right but heres what ive tried... I looked throguh your script and found the action that appears to execute my API calls "com.vmware.coe.dynamicTypes.pluginGenerator.presentation.executeRequestJsonText" and cloned it to a new action where i added my custom API session calls. I ran the workflow "Set a custom action for a host" and selected the only rest host i have, which was created by the workflow "Plugin gen -2- Add new host", and selected my cloned action. If i look at the custom properties of the rest host i see the custom property "customRequestAction" and its set to the value of my cloned action. When i run "Plugin get -3- Create a type" when on the find relation page i get a 401 HTTP response stating that the session is not valid which is the result of not including the session header that i added in my cloned action. If i add the custom API session call directly to "...executeRequestJsonText" and run "...Create a type" i get the expected response. It appears that the create a type workflow is not picking up the custom property on my rest host that defines my custom execution action.