Hi @Sandra Henderson,
The retainer fee is super easy to automate, all you need to do is to create a recurring invoice for that amount. However, the hourly rate is harder to automate because of how unpredictable it can be.
What I would suggest is to create an automation for that: create an invoice template for the hourly rate, setting it to an average number of hours you typically work. Then set it up to go out every month (or on your invoicing cadence), but make sure that you have “request approval before sending” turned on for each of them. This way, all you will need to do each month is to adjust the number of hours and click send.
Finally, since you can’t make it an eternally recurring automation, I’d make it as long as your’d like - and end it with a task for yourself to reapply the automation once it finishes running.
Let me know if this helps!