There are two ways to do it.
Simple method is to go the rules page, select all rules, right click and copy. Then paste it in new MS Excel file. You can save it any format you like. If you paste in Notepad or Notepad++, add <html><body> and </body></html> tags before and after the text you pasted, then save the file with .html extension. This will look exactly like what you see in CSM. If you use object-groups, you won't be able to see what's there inside the object group.
A little more difficult method is to use CSM REST API. You can read the rules in any access rules policy. The response contains all the rules in that policy along with definitions of all the policy objects in XML format. You can then modify the XML output to any format you like, depends on how creative you want to be with it.
Regards,
Chetan
