I assume you want to track these items on the balance sheet. Create a manual account on the accounts tab and add a row for it on the balance history tab. Add a new row on the balance history tab every time the balance changes.
Example: You loan 10,000 to Dan on 01-01-20. He will pay you back half on 06-30-20 and half on 12-31-20. On the balance history tab, show 10,000 on 01-01-20, show 5,000 on 06-30-20, and show 0 on 12-31-20.