Renaming a document is useful especially when you want to change the default name for a duplicate document. You can change the name of the document as many times as you want.
Select the document in the Document portal for which you want to change the name.
Click the More button next to the selected document and select Rename from the options.
Enter the new name for the document in the Name field of the Properties window. Note that your document is saved with a new name.