HI BlueSkies Thanks for the questions.
It sounds like you may be looking for a subscription-style billing setup. One option is creating a recurring job with billing set to a fixed monthly price. For a yearly total of $300, you could bill $25 per month, even if visits vary. You could also enable automatic payments if a card is on file.
For the visits, you can schedule them roughly every two months and adjust as needed. This way the billing stays consistent while the service visits follow the program timeline. If you have further questions, our Success team would be happy to help! You can reach them at 1-888-721-1115 option 1 or support@getjobber.com