Hello Mike,
the Value Mapping for B1iSN9.0 and B1if is attached to the Scenario Packages.
Please have a look into B1i Online Help searching for "Setting up Value Mappings".
Here you find the definition of the value mappings, which can be either used in the OUTBOUND or as Value Mapping atom within the scenario step.
The value mapping values for the previously defined value mapping fields can be maintained during the scenario setup.
There is a main difference to the old B1iSN8.8 version: You don't have a global value mapping definition for all packages which need to be attached to the concrete value mapping fields, anymore.
It's part of each scenariosetup, now.
If you need to copy old value mapping values you can either follow the B1iSN 9.0 Administrator's Guide, on page 65, chapter 8: Migrating Value Mappings from 8.8 to 9.0 or just use CSV import functionality to maintain the B1iSN9.0 value mappings, directly.
Best regards
Bastian