Select the Matter
Choose exactly 1 hour for the Time
Then, in the "Billing Rate", enter the monthly retainer or any other Fixed Fee that you want to charge
Enter the
Description, then click on save.
This entry
will be shown as One Hour (or one Unit) at the Fixed Fee amount on the
invoice.
When you create the Time Tracking it will show you how many hours it was worked on but it will be $0:
To set that up, open the matter, go to Settings then click Edit:
Then go to Members and click Edit:
Input $0 per hour and click Save:
Or you can simply change the Billing rate when you are creating a Time Tracking: