How to process unpaid billable expenses when migrating from Quickbooks

I think I follow. It’s pretty clear to me that you have to choose a method and stick to it. As for timely entries, I’m not the greatest with that. I usually lag for a few days and then catch up all at once. Quickbooks made it pretty easy for me to enter transactions in a timely manner since my automatic bank feed was activated. QB also made it easy to accidentally duplicate entries.