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Before you can create any jobs, you need to create a Job Template. The template ties together the data to be collected for the job with what is needed for the job. Once the template is created, a Job can be created manually.
Jobs can be set to be done on recurring job schedule, which could be a particular day of the week, month of the year, or every X days or months.
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Using Geofencing you set up the jobs so that field workers can only check in and check out while they are at the job location, with a small buffer to allow for inaccuracy.
Some miscellaneous job-related questions can be found on the Jobs Q&A page.