CRM migration is one of those tasks that looks simple on the surface "just export and import" and reveals its complexity the moment you start. Duplicate contacts multiply. Custom fields do not map cleanly. Deal history does not transfer. Activity notes are lost. This guide is the structured process that prevents all of these.
What CRM migration actually involves
The most common migration scenarios in Mumbai: spreadsheet to Zoho/HubSpot, Zoho to HubSpot (or vice versa), legacy custom CRM to a modern platform, and contact-only migration after a re-architecture.
The 6-step migration process
Step 1: Audit and clean the source data before migration
Export everything from your current system. Before migrating, clean the data:
- Remove duplicate contacts (match by phone number and email)
- Standardise phone number format (+91 prefix, 10-digit number)
- Fill in missing fields where possible (lead source, contact owner)
- Archive contacts with no activity in 12+ months (do not migrate dead data)
- Review deal stages map your old stages to the new system's stages before migrating
A messy migration produces a messy destination. Clean first. Migrate second.
Step 2: Map fields between systems
Create a field mapping document: Old System Field ? New System Field. For example: "Company" ? "Company Name", "Phone" ? "Mobile Number", "Stage" ? "Deal Stage."
Pay special attention to:
- Custom fields that exist in the old system but not the new create them in the new system before importing
- Fields that need transformation a "Yes/No" field in the old system may need to map to a dropdown in the new system
- Lookup fields fields that reference other records (like "Owner" referencing a team member) need the team members created first in the new system
Step 3: Migrate contacts first, then deals
Import contacts before deals. Deals in most CRMs are linked to contacts if the contact does not exist yet, the deal import fails.
Run the contact import in a test batch of 20 records first. Check that all fields mapped correctly before running the full import.
Step 4: Migrate deals with stage mapping
Map your old pipeline stages to the new system's stages before migrating. A deal in "Proposal Sent" in the old system should land in "Proposal Sent" in the new system not in the generic "In Progress" catch-all.
For deals in closed states (Won, Lost), verify that the closed date, deal value, and close reason transferred correctly.
Step 5: Verify activity history
Activity logs (calls, emails, notes) are the hardest to migrate. Most CRM-to-CRM migrations support note/activity export in CSV, but the format differs. Check:
- Notes appear against the correct contact record
- Dates are preserved
- The author of the activity is attributed correctly
For spreadsheet-to-CRM migrations, activity history typically does not exist the migration is contacts and open deals only.
Step 6: Run parallel systems for 2 weeks before full cutover
Keep the old system accessible (read-only) for two weeks while the team uses the new system. This allows fallback if a critical record did not migrate correctly, without the pressure of the old system being unavailable.
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Book a Free Strategy Session ?Frequently asked questions
Use your pre-migration export as the source of truth to reconstruct missing records. This is why Step 1 (audit and export before starting) is non-negotiable.
For a clean dataset of 500 contacts and 200 deals: 2 3 days including cleaning, mapping, migration, and verification. For 5,000+ contacts with complex field mapping: 1 2 weeks. We scope migration projects specifically. Contact us.
WhatsApp conversation history does not export in a CRM-readable format. The conversations exist in WhatsApp's own backup. What transfers: notes and activity logs that your team manually added to the old CRM. For this reason, logging WhatsApp summaries as CRM notes is an important habit.