Hi there, @hellymktg-yahoo-. 

Thanks for asking us here in the Community. Yes, you can import your data like your existing lists (suppliers, customers, inventory, chart of accounts) and your opening balance from Tally ERP or another software into QuickBooks. 

Please note that you can only use either CSV (Comma Separated Values) or XLS/XLSX.

You can check out this article to learn more about this process: Import data from other software into QuickBooks Online. 

For future reference, you also want to know more about connecting your bank and credit card account to QuickBooks to download bank transactions automatically.

I'll be here to guide you more with your additional concerns. Take care!