Creating Revision form in quickbase

Dear Quickbase Solver, 

I have a problem that i need to solve in my organization. 
We have form Purchase that already establish and i need to make a revision purchase form in it. 
For example, Purchase form is already submitted and approved and suddenly the requester want to change the items inside the form. Easy way to do this is requester just edit the items and click save, however we would like to record the previous form approved as a history record for us to view. 
I hope my question is clear enough to understand. 
How can i execute this function in Quickbase ? 

Many thanks

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Quickbase Admin
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