How do I represent older payments down on a liability without screwing up the current balance of the account?

I have started working on fixing the gaps in my books. One of those was creating fully represented assets and liabilities. This was easy for the assets that were acquired this year, 2022, as all payments out of the checking account toward the loan were also in that year. It was easy to find the automatically linked bank entries and categorize them as a payment toward the liability.

However, a few of the assets were acquired in the previous year, and have payments toward the liability from those years that I cannot get represented properly. If I record them via a journal entry, I have to have a 'balanced' credit/debit, and if I use the Checking account, it takes the linked account and adjusts its numbers.

So, let's say I have 100,000 in the Checking account now as of December 2022. I have created an asset at 50,000, its original value. I also have a liability account representing it at 50,000. And I have a payment made in December 2021 that shows 1000 (ignoring interest for example's sake).  The checking account balance currently on the books already represents that in the 100,000, so if I use a journal entry dated for 2021, it will actually change the balance in 2022 to 99,000 at the same time it changes the liability to 49,000. I need to just show that the liability has been paid down without affecting the 100k balance.

So, is there a way to do that? Or do I just flub it by setting the starting balance to what it was in 2022, ignoring the old transactions for the sake of just representing this accounting period?