Kent-logistics-Laravel/app/Models/InvoiceChargeGroup.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class InvoiceChargeGroup extends Model
{
    protected $fillable = [
        'invoice_id',
        'group_name',
        'basis_type',
        'basis_value',
        'rate',
        'total_charge',

        'tax_type',
        'gst_percent',
        'total_with_gst',
    ];

    public function invoice()
    {
        return $this->belongsTo(Invoice::class);
    }

    public function items()
    {
        return $this->hasMany(InvoiceChargeGroupItem::class, 'group_id');
    }
}