Merge line items from multiple invoices

I have 4 invoices that are ordered every first day of the week. At the end of the month, I want to send 1 invoice to the client. How can I merge the line items of these 4 invoices to 1 invoice?

Not by default. You will need create the functionality.

One way to solve might be by creating a custom module that collects information of the required invoices (via custom related fields) and then creating a after/before logic hook to create a new invoice from the related invoices.
Here it might be useful the Collection of fields created by “p.konetskiy” to collect the invoices’ in one field

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