Entering a transaction with an open period is unavailable in QuickBooks Online. Another workaround you can try is record the bill with the right dates then create a journal entry to offset.
The offsetting Journal Entry should use the same accounts the bill uses and should have the same date with the bill. Once done, create another journal entry with the current date using the same accounts to offset the first journal entry created.
As mentioned by my colleague above, it’d be best to consult your accountant before doing these steps for proper recording.
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