Use this for a cost that covers future months, like yearly insurance.

Open Purchases, tick Spread over several months and set the count.

Period = starting month.

Total amount = full cost.

Mark Paid in full if paid, or enter the paid part and pick the Vendor.

NapkinLedger holds the future part aside and moves one slice to costs each month, so one big bill does not crush one month. Add a Reference and press Record it.