Data Cleanse Best Practise

Ged Leigh
Ged Leigh Posts: 10
edited July 2022 in Sales CRM #1

I have a 32k database in Pipedrive where we know the data quality is poor.  I am using an external company to cleanse the data which wil be delivered as an Excel sheet.  

Question: How do I overlay the clean data onto Pipedrive without losing existing contacts that are already linked to Leads and Deals?