Kareem,
API Portal v3.5 doesn't have the ability to filter or distinguish API requests based on HTTP Method.
In API Portal v4.2.x, you would need create your own Viewlet in order to be able to capture, filter, group by the "methodType". You can find this by going to the Analytics Dashboard, clicking on Viewlets on the left side navigation, then clicking on the "Create a new viewlet" button. You'll be presented with a setup wizard that allows you to select which fields you want to include in the report, what you want to group by, what you want to filter on, and how to visual present the data (e.g. graph, table). The field that represents the HTTP Method for the indivudal call is "methodType".
--Azad