Combine two plugins and a php script into one Wordpress plugin.

I have two plugins and a script that I would like combined into one plugin with three tabs. I need simple changes made to one of the plugins. It is a plugin that creates a table in the Wordpress directory and uploads a text file to it. I would like a part added to that plugin that shows all tables in the database with the number of records in each one and allows the user to select one or more of the tables and empty or delete them. The script is a search and replace script and works perfectly, it just needs to be added to the mix as the third tab. It is made so the user enters database name, user name and password. This information needs to be drawn from the Wordpress database so it does not have to be entered.