I found an easy way to create a non-reusable transformation from a reusable transformation. Follow the below steps to create a non-reusable transformation or session or task from a reusable transformation or session or task in informatica is
Go to the Navigator which is on the left side. Select the reusable transformation or session or task which you want to convert to non resuable with the mouse. Drag the object (transformation/session/task) to the work-space and just before leaving the object on the work-space hold the ctrl key and then release the object.