If you added columns to the companies table you need to add them in 'application/models/companies/base/BaseCompanies.class.php'. There you will notice a private static property called $columns. There you should add the names of the columns as keys in the array and the data types as values. Then, on BaseCompany.class.php you should add the getters and setters (i.e. functions that return the column values). Those two classes, as their names say, are for the basic stuff. More complex logic, like queries that handle other objects should be put in Companies.class.php and Company.class.php (of course, you can put it wherever you please
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Then, in 'application/views/company' you have the HTML files that you need to edit to add and display this new data. In add_company.php you should add the form elements to enter the new data. If you name this form elements as 'company[property]', where 'property' is the name of the database column you added, then that's all you need to do to set the column value as the element's value. If you need to post process this value before putting it into the database you can do so in 'application/controllers/CompanyController.class.php', in functions add_client and edit_client. Finally, in 'application/views/company_content.php' you can display the new data.
Cheers.
