You don't say which way you want to link or what you need to do.
If you want to create reports in Access from a project database then you can
link tables from project into Access. When you do the Link in Access and look
for the database, project databases are not listed, ut if you look for *.mpd
files and find your project database you will get all the tables listed.
As the previous poster said, be very careful editing any data in any of
these tables. Its very easy to break a project, as I've found out.