How to modify or delete custom fields?

How to modify or delete custom fields?

Hi, 

I created a few custom fields for Items in Zoho Sales and would need to update/modify some of them, and to delete others.
However, when i try to delete or to modify settings (such as "Display when creating transactions" from Yes to No), I have the notification that "since the custom field has been used in some transactions, it cannot be deleted" (although for some fields i just try to modify settings of the custom field, not to delete it)...

What to do in that situation?
Thanks in advance

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