ember-dynamic-segments-controller

controllers.addproject.js

import Ember from 'ember';
import {alias} from '@ember/object/computed';

export default Ember.Controller.extend({

  controllerempid: alias("model.empid")
  
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Dynamic Segments',
  empid: 6
});

router.js

import EmberRouter from '@ember/routing/router';
import config from './config/environment';

const Router = EmberRouter.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('addproject', {path: '/employee/:empid/addproject'});
});

export default Router;

routes.addproject.js

import Ember from 'ember';

export default Ember.Route.extend({
  model: function(dto){
        return {
            empid: dto.empid
        };
    }
});

templates.addproject.hbs

in addproject route
<br>
empid in controller = {{controllerempid}}

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
empid: {{input value=empid }}
{{link-to (concat "go to addproject with empid=" empid) "addproject" empid }}
<br>
<br>

{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}