QUESTION ON TRACKING BALANCES

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I'm fairly new to GnuCash, but I tried various things with Quicken and 
found it cumbersome to accomplish.  Here are some questions I need help on:

I want to track TOTAL balances due, such as on mortgage and car loan, 
but I also want to track the monthly payments due, so that both MONTHLY 
DUE and TOTAL DUE will be there at a glance on my ACCOUNTS page.  Don't 
worry about interest and principal in your examples, unless you want to 
- I think I can get that idea on how to configure that after knowing the 
basics.  Thanks!

Jerry in Michigan, USA