Hi there, misokol.
Currently, the only way to know how much payments were applied to the bills is to open the check transactions or to see the stubs.
In this case, I would recommend running a quick report for the vendor. You can do that by right-clicking the vendor's name and choosing QuickReport. This will show you their list of transactions, which you can export to Excel. Then, you can filter the bills add more columns, where you enter the payment details against them. That can be our workaround a the moment.
Let me know if you have additional questions about this.