Payments From Treasury- Record in PS But not Trigger Payment

Currently invoices paid through Treasury department are not recorded in PeopleSoft. 

We would like record these in PeopleSoft without triggering a payment- I was reading about adjustments but not clear on process or if that's the correct solution

We would like to understand how to enter directly/ correctly in Peoplesoft & the options needed.

And if possible we would also like to use the voucher upload form to record the already paid invoices when there's numerous payments & what that process would look like