php freelancer for finish inventory app

REQUIRED INMEDIATLY AVAILABILITY TO WORK ON THIS PROJECT BONUS $80 IF PROJECT IS FINISHED BEFORE JULY 31. we are looking someone faster in php coding. Website. [login to view URL] This application is for resell items for distributor. Basically the application import items from different providers and then show in VIRTUAL INVENTORY(a section) the item with best price under predefined parameters. The application had a section called STOCK PRODUCTS in which products are not affected by BESTPRICE FORMULA and willl appear inmediatly in Virtual inventory if is available on stock. The app export the inventories to excel. All these features are already developed. Only must be rechecked if all formulas are applied good and correct somebug for determine the item that will appear on virtual inventory together with some minor visual changes like reduce field width, header area, etc. Must be corrected the title of the excel file when will be exported. Must be created about 60 columns in VIRTUAL INVENTORY PAGE, about 10-15 columns with dropdown list and the remaining only text fields columns. (one of these column will be MANUFACTURERS, in which admin will create manufacturers and the created manufacturers will appear in a dropdown list on this column) Is required develop a category system for store inventories under categories. Admin must have the possiblity of create and delete categories. Also the possibility of create column ( already created) and select if the column will be a textbox or dropdown list and create option for dropdown list. Is required to modify export feature. For export preselected columns may be required some 3 or 4 others task not complex so quote it together. If some of these not declared task are very complex i will understand about any price increase.