I am trying to delete a variable in a workflow because it is not longer needed. Workflow designer won't let me delete the variable because it says the variable is in use by a Initiate Workflow action. I can't find any action labeled Imitate Workflow.
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Same thing happened to me!
I had a workflow with variables required on start and has customised the start form to include them on. A couple of weeks later the spec was changed and I no longer needed some of them. I edited the start form again and removed them but still I couldn't delete the variables from the workflow and was getting the same message about "Initiate workflow".
I published my workflow without any references to the variables on the start from or anywhere else in the workflow and closed designer. when I went back in to the workflow I was able to delete the variables.