What I do is search the employee's receipts for a specific timeframe, then possibly choose a client.
Then I export all those as a PDF, so that I can get copies of the receipts, just in case the client needs proof for their own records.

Then I have to go back out, and filter everything again, to be able to download the exact same report, but in a CSV format. So that I can more easily create the list to add to the invoices.