how to create customized component in BT120H_CPL In webui screen

Hi Crm expects please help me for this developement how can i start?

TO CREATE 2 CUSTOMIZED COMPONENTS HAVING:

(I) CATEGORY,TYPE AND SUB-TYPE RESULTING IN DETERMINATION OF TRANSACTION TYPE,

(II) BUTTON CREATE COMPLAINT/SERVICE REQUEST,

III) ON BUTTON CLICK NAVIGATE TO PAGE FOR CREATING COMPLAINT/SERVICE REQUEST AND AUTOMATICALLY POPULATE THE VALUE OF CATEGORY, TYPE AND SUB-TYPE.

Thanks A lot in advance

please guide me how to complete this requirement