How to Create menu / section for the existing object

Dear Sriraksha,

Firstly, we highly do not recommend to create several sections per one object. Please note, that data will be duplicated in both sections, since they are referring to one object. You can create a new object in the system with the same range of columns and copy data from initial object to newly created. 

Nevertheless, if you intend to add section manually, please take a look at following tables: 

SysModule,

SysModuleEdit,

SysModuleEntity, 

SysModuleInWorkplace, 

SysSchema

Regards,

Anastasia