Any new Partner(Supplier or Customer) mappings can be created through Channel App. The Partner details provided in Channel App UI will be flown to OMS and the partner(Supplier or Customer) will be created at OMS along with the partner mapping required at CIMS.
The same screen can be used to update the existing Partner(Supplier or Customer) details.
Go to Channel App-> Partner
Go to Partner Form tab.
Below imge shows the sample Customer details added in UI.
Please navigate to Partner Location Form Tab. Enter the shipping/ billing address and other required details.