after creation of chart of accounts, go GL >General Journal , create one ledger account (offset a/c)only for to enter opening balances, for eg ledger account no 66666. eg :
Asset a/c Dr 20000
To opening balance A/c (66666) 20000
Opening Balance A/c (66666) Dr 100000
To Capital A/c 100000
Customer A/c Dr 55000
To opening Balance A/c 55000
Opening Balance A/c 60000
To Vendor A/c 60000
After posting this entry verify balance of 66666 A/c , it should be zero . becauze debit = credit as per your trial balance.
but we have COGS account in Ax and not purchase. so how can we import balances for COGS if we have purchase account in legacy system.