I want to show the location of the item inside the store and show that on the invoice
There is a field in Sales Invoice Item that you can add to the Sales Invoice print format. It is called ‘warehouse’
i want location inside warehouse
So this depends on if you’ve setup your bin’s inside your Warehouse Tree. Here is an example of ours. ERPNext doesn’t have an official RARB system in place. This is the only way I found to do it with vanilla ERPNext. But there is a thread discussing this further: Warehouse Bin System
Yes, you are welcome to use the RARB functionality we have built on top of ERPNext.