Thanks for posting, @rich-lysakowski-.
I'll share some information about To-Do List. This feature isn't available in QuickBooks Online (QBO), you'll have to check for a third-party application that integrates with QBO.
You can also check out our website. Here's the link: QuickBooks Apps.
In case you want to set up reminders for your transactions, please refer to this guide. It has step-by-step process to guide you along: Schedule recurring transactions created with a template.
Please leave a comment below if you have follow-up questions or concerns about your bookkeeping tasks. I'll be around for you. Take care.