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SFDCIronManSFDCIronMan 

Data Migration help me Import Data in my Org

Create two record types on account - Partner, Supplier.
- Attached is Account & Contact Data to be loaded.
- You are free to make any changes in the salesforce data schema to ensure that Contacts are connected to their respective Accounts on the basis of Account Unique Id of the external system.
Best Answer chosen by SFDCIronMan
VinayVinay (Salesforce Developers) 
You can use Dataloader to achieve above requirement.

Check below references that can help you.
https://help.salesforce.com/s/articleView?id=000314982&type=1
https://trailhead.salesforce.com/content/learn/modules/lex_implementation_data_management/lex_implementation_data_import
https://trailhead.salesforce.com/content/learn/projects/import-and-export-with-data-management-tools

Hope above information was helpful.

Please mark as Best Answer so that it can help others in the future.

Thanks,