This Community Post below has relevant info about a timesheet import format compatible with the Reckon Accounts Hosted and desktop applications.
Payroll import IIF file - from payroll software to Reckon Premier — Reckon Community
If you are familiar with Excel and working with CSV/Tab-delimited text files then that may be an option for you.
There are also tools available from the Reckon Add-on Marketplace related to data import for other functions you may be interested in.
@cosmic and @PhuongDo have other automation tools available that can help you.
Cosmic Bills | Marketplace (reckon.com)
Beanwiz Free Version | Marketplace (reckon.com)
Masterpiece Payroll export from 3rd party payroll (coming as csv) — Reckon Community
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