core php expert needed to fix some issue on a website

Add this further functionality to insideers.com.. Can you create a page that is a Change Log of some sort for the site? (Which user and what value was changed and a timestamp? Maybe link that change log page to the admin menu. Maybe limit that to show the last 30 days or something like that, so it doesn't grow indefinitely. Can you make it so when a quantity of a part is added to an RO, it will reduce the Quantity of that part in the "Parts" inventory page? Can you add a toggle somewhere toward the top of the new PO, and edit PO page that would allow the PO to be saved as "PO" or an "Estimate" . When "Estimate" is selected, I would like it to not reduce the parts quantity from the inventory if a part is added to that estimate PO. Can you add an "export" button to the parts page, that would export all the parts records in an xls format or some format that would work in excel? can you do the same thing for services? Thanks