Problem of many online sellers is stock management, every day and every month they have to calculate the total income/expense etc...
There are some basic feature below.
Add/Edit product detail such as price,cost,size,color and image
Create buy/sell order.
Buy/Sell order will be show in order list menu, you can also view buy/sell history.
Delivery list can be viewed from delivery button in Order list tab.
Easy preorder product.
User can add delivery method in more tab.
Other expense can be added in Expense tab.
Expense tab will show your daily and monthly sale/buy.
Wish this Application will help you more convenient to manage inventory.