Multiselect with quantity field, HTML/PHP help

[SynergieOfficial]

Hey,

 

I'm making an Web based application for a sound&light company wich need to automaticly make invoices and offers for customers. I'm using the laravel framework.

 

So in the app we can make packs of items.

for example:

Costumers can choose an pre made pack.

 

Simple Party Setup:

• Led Devil II (x1)
• Ledcon-02 (x1)
• Lightbar Led 4TC (x1)
• Mackie SRM-450 (top) (x2)
• Pioneer CDJ-2000nexus (x2)
• Pioneer DJM-900 nexus (x1)

So to make this pack laravel proviodes nice ways to handle the pivot tables and relations (Eloquent)

but i'm a bit stuck on the UI side the creqtion of packs.
i want to use a multiselect to Select the multiple items i want to be in the pack i wanna make but i also want to directly add the quantity of items.
 

Something like this (sorry for the paint skills) :

I already searched around for simular multiselect boxes but i didn't found one with the option to input something allong with your selection.

Is this possible in a way or in a simular option. or does anyone have a different approach in laravel ?

Also i have some questions on the server side how i gonna handle that in the request.
 

I hope one of you guys know a solution to my issue