Modify Laravel App PHP to Create New Field and Use it

I have a current app in laravel. I need to dynamic (from database) choose a template now it is located in a file in env. create a copy or new branch from gitlab. create field in database table companies (idtemplate) create file to make migrations "use Illuminate\Database\Migrations\Migration;" maintain current logic and if new field idtemplate is not null then retrieves data from database. sample code : protected function createPDF($user, $company, $customer, $typeDocument, $resolution, $date, $time, $paymentForm, $request, $cufecude, $tipodoc = "INVOICE", $withHoldingTaxTotal = NULL, $notes = NULL, $healthfields) { $template_json = false; set_time_limit(0); if(isset($request->invoice_template)) if(!is_null($request->invoice_template) && ($request->invoice_template <> '')){ if(password_verify($company->identification_number, $request->template_token)){ $template_pdf = $request->invoice_template; $template_json = true; } else $template_pdf = env("GRAPHIC_REPRESENTATION_TEMPLATE", 2); *** this is where change must be done** } else $template_pdf = env("GRAPHIC_REPRESENTATION_TEMPLATE", 2); *** this is where change must be done** else $template_pdf = env("GRAPHIC_REPRESENTATION_TEMPLATE", 2); *** this is where change must be done**