Two methods
1.Design it in the transformation developer
2.Promote a standard transformation from the mapping designer.After U add a transformation to the mapping , U can promote it to the status of reusable transformation
Once U promote a standard transformation to reusable status,U can demote it to a standard transformation at any time
If u change the properties of a reusable transformation in mapping,U can revert it to the original reusable transformation properties by clicking the revert button
