Write some Software

I would like to extend and add-on to the existing functionality of a web application I am currently using. The system it runs on is Linux / Ap[ache / MySQL / PHP (LAMP) The upgrades to the code are fairly straightforward, and include adding new columns to online reports, triggering text shortening functions, etc. to make the data displayed in the online reports more complete, readable, and useful. I would also like to recycle / re-use a function from one of the report screens, to be used on another report screen. The data pulled from the MySQL database would be only slightly different, e.g. same database, same table, just different fields. But the overall functionality would be the same. The front end report screens I wish to modify are written as Wordpress / Genesis Extender Widgets, and the back-end is SugarCRM. The system already works very well so I am NOT looking for a rewrite. Please be very specific in your proposal if possible.