Lead Conversion Mapping Aftermath

Lead Conversion Mapping Aftermath

Hello,

I am still playing with Zoho but when my leads were converted to clients, the client's file is now missing their date of birth after the conversion. I fixed the lead conversion mapping so this doesn't happen in the future but i have over 100 clients that do not have their date of birth showing.

My question, is there a way to get the 100+ clients to have their date of birth showing again in their converted file? Maybe like some sort of mass update?

Thanks in advance.