baoshi-was/app/ProcessesAdditionalBill.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class ProcessesAdditionalBill extends Model
{
    protected $fillable=[
        'process_id','wms_code','bill_type','amount'
    ];

    public function process(){
        return $this->belongsTo('App\Process','process_id','id');
    }
}