Hello Gaurav,
Where do you want to add the company name ? Color change of what in the dashboard ?
The UI of OPI dashboard is generated when you call Generate action in your Business Scenario.
Customization in terms of number tiles and text is possible, but beyond that you have to modify the generated SAPUI5 code - which will affect all the business scenario look-and-feel in that HANA server.
Please write to us your usecase and specific project requirements - so that we can help better.
Thanks and Regards,
Archaa