Customize Wordpress customer portal plugin

I need to customize a purchased Wordpress plugin to suit my company`s needs. The plugin itself is a customer portal system, where the client can log in and access documents, upload documents, get access to member pages and sending messages to our managers. All these functions are already made, and are working well. Today, all these functions are displayed at one page. I want a seperate page for each function. Example: Today: Page 1 after login: Welcome page with access to documents, upload documents, access to member pages, messaging. How I want it to be: Page 1 after login: Welcome screen, show the last 3 documents uploaded from manager, show the last 3 messages between customer and manager and possibility to write new message. Page 2: Access and upload all documents Page 3: Access to member pages Page 4: All message history and possibility to write new message. The customization also includes making a new menu for displaying these pages besides the standard wordpress menu. Please contact me and I will give the name of the plugin and link to its website. I will also send screenshots with more specific requirements.