Unable to delete methodology in LCS

I have created new project and tried to change the methodology.

By default the methodology shows as Analysis > Design and develop > Test > Deploy > Operate.

As we are following a different methodology for the project, I clicked on the Edit methodology, there I am unable to delete or edit the default.

So I tried using Append methodology, it just added another set of Analysis > Design > Test > Deploy> to the above methodology.

Again I am unable to edit any of these. Overall I see 10 phases now that are not relevant to my project. 

Could anyone please help me on how to edit / delete the phases that got added by default? 

Thanks.