If you are using trust accounting then you will need to load the opening balances for each matter. This can be as simple as creating a deposit for each of the clients to reflect the balance at migration day. This means that the date of these deposits should reflect your opening balance date.
If you have a large number of trust transactions then you can import these from a spreadsheet. See Data Import
Where your trust account has any un-presented checks the balance will need to increase the balance by the un-presented check amount an renter the check as a payment.
Do not set any opening balances for the trust bank and liability accounts. The account balances will be set as you load/import the trust transactions. The only exception is if your trust bank balance exceed your total trust liability (in other words you have a trust surplus). In that case only load the trust surplus amount in the opening balance for the trust bank account.
Receiving these balances as deposits will mean that an initial reconcile of the trust account will need to be done separately from the reconcile needed to verify all transactions which actually occurred in the month after your opening balances date. Click here for more information on reconciling within Actionstep.