Hey there, @Shilpi! Thanks for reaching out in community. 🤗
Can you elaborate a bit more on what you’re looking to achieve with your zap? 🙂 Sometimes it helps to describe it like, "When this happens in xxx app, do that in xxx app."
I know you mentioned specifically you’re looking for custom fields in Leads but is this for a trigger or an action step?
Could you please tell me if this Pipedrive account has more than 500 custom fields? If so try removing any unused fields as the Zap can only access 500 custom fields.