If you would like to handle your XPS files, you must use NIXPS. It is a powerful editor of XPS file.
It allows you to create and modify your XPS file. In your document, NIXPS inspector lets you view your file structure, used fonts and images, extract and replace them if it is necessary. It includes a merging tool for merging pages into a single XPS file. With this software, it is possible to extract any part from your document and save it to a separate XPS file. In order to create an XPS file, preset templates are integrated into the program, all you have to do is to give information about your files and modify XML file of the program if you like.