In this article, we will see how to add items to a multi-select option set attribute within a workflow using the community utility Dynamics-365-Workflow-Tools SetMultiSelectOptionSet.

In the above workflow, the customer (related opportunity account) Business Regions will be added to the Opportunity. If this opportunity already has some values, they won’t be removed. The “SetMultiSelectOptionSet” utility will just add new options when the input parameter “Keep Existing Values” is set to true:

The “Keep Existing Values” is a new input parameter that has been added recently to the community utility Dynamics 365 Workflow Tools SetMultiSelectOptionSet as well as MapMultiSelectOptionSet.