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I want to be able to group/merge multiple expenses being on-billed into one line on an invoice, even if they're not a tracked expense.

For example, if a contracting company has billed for a fortnight of the contractor's work, but has separated that into two lines, each dealing with one week, on their bill, then the draft that is created when they e-invoice me will have two lines. When I assign these lines to a project and approve the bill, each line shows up as a separate expense to be on-billed. If I am on-billing the full fortnight, I would like to have the option to merge those into one line, just as I can if I am not using Projects but assigning the billable expenses to a customer directly.