Copy a trial balance in Manager

I have to transfer data from a different system into Manager. I have asked for the trial balances to put it in Manager by a joournal entry. Fixed assets, Customer and Creditor accounts have sub ledgers, so no problem, but not the bank and cash accounts. How do I fix this? Anyone an idea? Thanks in advance, Bert

Did you read the guide?
https://www2.manager.io/guides/15718

Starting balance can be used with more detailed data transfer, depending on your goals and resources. See

Batch Operations: Use Batch Create and Batch Update functions |

And bank imports