To get client data from a saved file back to the master file
 

I have designed a programme that records data and also links to another
programme, but when I save the client information the name of the file
changes and I loose the link.
I want to be able to open a master copy each time and get the client data
from the saved file so I can update each time and resave updates information,
this way the link will always be there, I hope?