How to split big database diagram on many pages?

[ETN]

I am designing a big database (over 200 tables). Having all thoses tables is quite hard to read. I can separate my tables on separate pages successfully but I would like to be able to have on each pages the tables for a particular process (i.e. Clients tables on a page, Vendors tables on another).

Creating the main tables on each pages is not a problem but my problem is that I want to make some relationship with secondary tables (i.e. Countries) and I do not know how to use the tables that have been created on a page in others pages.

So let say I have on the Client tables page a table named: Countries, how can I use (relationship) this table on my page tables named Vendors without creating a new table?

Is there a way to work with this and what are your suggestions or way you do it?

 

[ETN]

Just to be more clear:

On the client page:

table clients:
.id_client (PK)
.id_country (FK from table countries)
...

table countries
. id_country (PK)
...

...other tables

On the vendors page:
table vendors
.id_vendor (PK)
.id_country (how to make the relationship?)

I could want to make a relationship with my table Countries in others pages also...