Transitioning from KashFlow to QuickBooks is a big step, info. I can provide details on moving data from different software to QuickBooks Online (QBO).
Please note that QuickBooks Online depends on data transmitted from Kashflow. Thus, contacting them is a good idea to confirm if there are any restrictions when migrating to ensure a smooth transition to QuickBooks.
I'm sharing this article to understand the essential tasks to consider before starting to use QBO: Post-conversion checks for getting started with QuickBooks Online.
I'm available for further assistance with data migration or to answer other questions. Tag me in the comment below.