Importing General Journal Entries - Payroll

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We use a third party payroll system. I want to import the general journal report from that provider into Sage, but when I called to inquire about it, they said that you cannot create general journal entries to accounts that are linked. They suggest that we do a manual entry. I am positive that a company with 300+ employees does not manually enter all that payroll information - they have to be importing it. Any tips on the import?