One way is from the PurePaths dashlet, click on a PurePath, on the Web request node right click and choose Details. The window which opens will contain information about the HTTP Method.
Another way would be to create a Business Transaction which splits on complete URL path and Web Request Method. This will create a results bucket for each URL & Method combination. Use this option carefully as it can create many splittings, add overhead, and possibly measure explosion (inflating of performance warehouse due to high number of results).
You can also create a "diagnostics" BT that splits on the "Web Requests - Method". This will allow you to drill into all GETs, and POSTs, etc. Just be sure to turn off the PWH storage for the BT.