2 件の回答
As far as I know it's not possible to access and modify inactive values of picklist throught Declarative Customization.
Using Apex, instead, you can obtain all picklist values and through isActive() method you can discriminate between active and inactive values:
https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_class_Schema_PicklistEntry.htm
you can do your logic on them through Metadata API, here you are an example:
https://salesforce.stackexchange.com/questions/268593/new-picklist-values-added-via-metadata-api-stay-inactive
and this is the official documentation about reactivating values:
https://help.salesforce.com/articleView?id=000316039&type=1&mode=1 (https://help.salesforce.com/articleView?id=000316039&type=1&mode=1)