I am testing out Zoho and need to be able to somehow associate Account records with each other.  

For example, I have four companies A, B, C and D that do business with each other.  I want a separate Account record for each one, but I want to somehow indicate that A does business with C and D.  I also want to indicate that B does business with C.  

I would like to be able to look at the record for A and see that it is associated with C and D.

I would also like to be able to look at the record for C and see that it does business with A and B.

I figure there must be a way to do this.  Any hints would be appreciated.

Thank you.