The closing just transfer transactions to "previous year" and transfers P&L to Balance. It can be run multiple times if necessary. It is not something related to separate accounts so I am not sure what is the question?
"Close a period" is done a bit different in NAV then in other accounting software. For regular users, just block in the accounting data for booking in the old year. For the main accountant booking can be kept open via de user settings. When all accounting is finished for the old year, you can "reset" the g/l cost accounts with a batch/report, this can be done multiple times as Golfer already mentioned. This will fill a ledger that you can book (on an ultimo date).
IF User.Loves('Edo') THEN ok() ELSE currReport.genSkip;
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