Customising existing iView by deleting fields/columns

Hi,

I wanted to know the tools/procedure require to customise existing iViews (in a MSS implementation).

If we want to say delete/add a particular field or column in an existing iView, what tools do we need? Visual Composer or Web Dynpro? Is there a step-by-step guide available for this?

Your input is greatly appreciated!

Thanks,

Aniruddh