Automatically Filling Like Data

Here's the outline of my problem...I'm building a directory of hedge fund contacts and need help in cleaning data and automating the entry of fields that will remain the same. I have one workbook with 2 pages... One is for the Companies and the other is for the contacts that work at those companies.

ex. Company #551 is 1794 Management - on this page we have fields for address, floor, city, state, zip, phone, fax and website.

on worksheet 2 is where the contacts are kept... the identifier is #551... on the contacts page all contacts under a specific company number will correspond to that company.

Here's where it gets tricky.... for the contacts the addresses are all formatted differently - first I'd like to sort by management co and address and have excel copy the first listed address format and copy this to the other contacts for that company.... when the formula reaches the next contact with company #552 it will look for the new first address and use this one for all that companies contacts.

after the formula finishes the fomating I'd like the sheet to become intuitive( dont know if this can be done but what I'm looking for is say when I add a new row and enter #551 as a company and enter the new first name, last name, and job title - if the excel sheet noticing that all contacts under that format have the same address, phone, fax, company name etc...