How can add customer opening balance

How can add customer opening balance. please help me.

You should load all the unpaid invoices.

I agree with @Davide but if it is too huge a task to load all unpaid invoices you can consider creating sales invoices for the opening balances only. Until the opening balances are fully paid you might find yourself referring to your old accounts receivable system while you are using Manager concurrently.

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Read the Guide: Set starting balances for customers | Manager.