How to Assign User-Defined Storage Capability
Procedure 1 In the vSphere Client, select View > Inventory > Datastores and Datastore Clusters. 2 Right-click a datastore from the inventory and select Assign User-Defined Storage Capability. 3 Select a storage capability from the list of storage capabilities and click OK.
In the below screen you will Storage Capability Window being updated (high lighted) with Replicated Store as this was the user defined capability we selected in above.