@Ugur01
"When we create our customer's 2023 Balance Sheet, the remaining balances from 2022 are added to the report. Can I get the Balance Sheet report for 2023 only from Quickbooks Online? "
No. A balance sheet is a snapshot (as of the report sate) of the business's assets, liabilities, and equity. All balances (except current year net income) are a running total from Day 1 of operations to the report date. You can run a balance sheet comparison report to see the difference between two dates but, in both cases, they will be the running total of all prior dates. With all due respect, if you're keeping books for a business, this is basic accounting knowledge and should be well understood.