Hello, 

I do have contacts (in the regular contacts module) in Zoho CRM that can be related to a custom module "Subscriptions". The Subscriptions will be displayed in a related list in each contact. 

So if I create a new subscription I can choose the contact in a lookup field. 

Is there a way to check if a contact is related to a Subscription with a workflow rule/function? 

I have added a dropdown/picklist in the contacts module with the name "Related_to_Subscriptions" (values can be Yes or No). And if the contact is related a subscription a function should change the dropdown to Yes. 

Or is there any other way to display in the contacts list if each contact is related to Subscriptions?

Thanks for help, 

Michael