In your 'Settings', you can manage the 'Import invoices from' date to control how old invoices will be imported from Harvest.  You can use this to build a history for your sales reps where you will also need to complete the invoice commission records in InvoicePayout.  

You will need to decide what is best for you and how you would like to handle marking the commission records that are imported are going to be marked as 'paid'.

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