Hello there,
I already made a software just like you want,
An Inventory management with Purchasment and Invoice/sales management,
Please take a look at the features/functionality :
1. Inventory of Products
- Add/Edit/Delete Product
2. Sales/Invoicing
- Create/Edit/Email/Export(PDF) Invoices, Manage payments, Shipping, Return Sale/Delete Sale
3. Purchasing
- Manage Purchase, Manage Expense
4. User Management
- Manage additional users for sales, staff etc..
- Manage suppliers
- Can add assign additional users to non internal people, like supplier & customer,
so it will be useful to keep communication inside your business process
5. Responsive theme and datatables
6. Infographic reports/chart & data table for Basic Accounting Reports, Sales Reports, Stock Reports, Payment Reports, etc
additional features might be invented during development.
It's a Web Based, so it can be deployed on LAN or Online Web Hosting.
Application is builth with PHP, JQuery, Bootstrap/Responsive, and MySQL Database.
Please, dont be hesitate to contact me.
Thank you