Accounting Entries at the time Uploading data from Legacy system for Vendor, Customer, G/L Account, Asset and Inventory

Hello Experts,

I would like to know the Acconting Entries at the time of uploading data from legacy system for Vendor, Customer, G/L Account, Asset Management and Inventory balances.

My concern is that how to nullify these uploding G/L Accounts in the uploading stage ?

Kindly provide solution on this query it is very helpful to me.

Thanks and Regards,

Vishal Jadhav