When creating invoices from a quotation there should be an option to partially invoice and a percentage you can input.
When invoicing from a quoted job, there should be an option to partially invoice rather then manually adjusting the value.
A simple partial invoice option and then a percentage you can add in.
Say month one you want to invoice 20% of the job, Xero & yourself/team would then know there is 80% left to invoice and so on, before 100% of the job is invoiced and can be ticked as invoiced.
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