At first select supplier which is come from the supplier list that is added by super admin. Select the available store or warehouse which also added by super admin in the item store submodule. Then need to add the reference number, receive date.
After that select the item from the item list which is listed in item list submodule, put it's unit price, quantity. Sub total will show the individual item's total price. After adding all sub total the final result will be shown.
If check the full paid option no due will be shown. If not, then put the amount in total paid field. If it's meet up the total due will zero, if not then due or surplus amount will show in the total due field. Payment method can also be selected in this operation.
By just clicking the add button, new item will be added in the calculation process.