Add rows in app on click of button

HI
I am new to Apex and PL/SQL. I am developing an application in which i need following things to be done.....I have created a FORM(not a report) in which there are fields ,
'F1' a select list,'F2' a display only field,'F3' Number field,'F4' Display Only…. arranged in one row.Also there is a Button 'Add Item'.
Procedure:
When user selects item from the select list i.e. field F1...its quantity is displayed in field F2(a spec. Number)...after that user must enter a number in field F3 which should be less than number in F2....as soon as user enters number in F3 there should happen a calculation (No. form F2 - No. from F3) and the result should autopopulate in field F4........after that when user clicks on 'Add Item' button..a row containing fields F1,F2,F3,F4 should be added just below the 1st row.
1. For the calculation part, where shall I write the code? do i need to create a validation or a dynamic action......
2.Please help me with the 'Add Item' button ...I really dont have any idea how a row will be inserted when i click on the button
any suggestion/logic/sample code/link to existing example are welcome...
THANKS

Thanks vincent....i now have a Form called 'Form on table/view' but i am stuck here
Ill explain the problem in detail to you
On the above form i have following fields,
Product_name(link),Total_ordered_qty now these fields are displayed here from table Product_list
Step 1:
when user clicks on product_name, user navigated to a page where there are following fields
Item name(auto populate from product_name),ordered qty(auto populate from total_order_qty),Inspection_qty(user i/p),Remaining_qty
Step 2:
when user gives some number as 'Inspection qty' a java script calculates (Total_order_qty - Inspection_qty) and auto populates 'Remaning_qty' field and will click 'Proceed' button
Now,
I want that, on click of Proceed button a record created in Step 2 should be inserted into some table so that i can keep the track of updated record. Also if Total_order = 500 and Inspection_qty = 200 then Remaining_qty = 300 this value should get updated in Product_list table. i.e. if user logs in for the 2nd time he will see Ordered_qty = 300 in Step 1.
Now this updated record..i want to show this under a Tracking tab so that user can see his activities.
Do i need to write a trigger to insert a record? if yes then where to write it? or there is any other way?
Also how am i going to calculate and display the updated values from step 2 in step 1?
any suggestion/logic/sample code/link to existing example are welcome...
THANKS

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