A standalone map is visible in the Transformations folder of the Project tab and represents a set of one or more mappings between source and destination nodes.
You can reuse this map by selecting the myMap entity from the Transformations folder in the Project tab and dropping it onto any orchestration in the project. This dropping action creates a new Map Variables activity in the orchestration with the same set of mappings as defined for the map called myMap. The new inline map created for the Map Variables activity is a copy of parent standalone map. If you change the mappings between the source and destination nodes in myMap, the changes are not propagated to new Map Variables activity because it is a local copy. For more information see Creating a Map Variables Activity from a Standalone Map.
To create a standalone map: