REST API Call for PO update

Content

We would like to do the following using REST API on a Purchase Order. Could you please let me know the REST API calls for these actions?

1. Deobligation/ reduce funding to an existing PO

2. Add additional line to an existing PO

3. Add more funds or increase the quantity/cost to an existing PO

Could someone please give me the REST API links for these actions? I could not find it in the REST API documents. We are in 21B version

thanks

Krishna Anand

Version

21B