Merge Doc with Excel

I currently have an excel spreadsheet that I use as a database for clients and I use Word for Proposals, Invoices and the like via a mail merge command that pulls in the relevant client line details into the Word document.

I require to put a section on the database spreadsheet which will merge in all the pricing details of our various events. So when I need to make changes it is updated only in one place and it affects everyone's documents accessing the database on the network (Only 3 users). However, this would obviously need to be done with absolute cell addressing (something like $A$1). How do I do this in a mail merge type environment?
Any input would be greatly appreciated.

Regards

Howard