ability to create purchase orders from freshbooks estimates

In Freshbooks... 1- We want to create a tab "Purchase Orders", where purchase orders would be saved for future use. 1- We need the ability to COPY a freshbooks estimate into a purchase order. 2- We hope that we can use the EXACT same functions that are used to convert an estimate into an invoice. 3- If #1 is not possible we want to be able to export (print, save, upload, etc.) a PDF version of the purchase order to our desktop. If #1 is possible we would have additional requests. 4- We want the purchase order to have the exact same functions and editing ability as creating and copying estimates.