Delete Calculated field in Azure SSAS-Tabular modal

Azure Tabular Analytics. I have the *.bim file where I added few calculations. Over the period, I kept creating new calculation fields but did not removed the old ones that are not in use. Now that I need to cleanup my project, how do I know which calculated field is not referenced anywhere by another calculated field? I don't want to accidently remove the fields in use. I was expecting something like rt. click on the field and see the option to get referenced fields but can't find anything. 

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