You can find out how ApprovalMax works by connecting to a demo organisation, which can be created in QuickBooks Online for that purpose. This way, you can test all ApprovalMax features without affecting your current QuickBooks Online data in any way.
This is how you switch to your real data
When you're ready to work in ApprovalMax with your real data, simply delete the ApprovalMax Organisation that was used for the initial test phase and create a new one. Then connect this new ApprovalMax Organisation to your actual Organisation in QuickBooks Online.
That's it.