Forms with multiple tables

I am new to cakePHP and am in the process of learning to use it.

I am wondering how I can have a form element populated with elements
from a different table than the model, for example

I am wanting to write a farm manager using cakePHP as the framework,
if I have fields that belong to farms, when you create a new field I
want to be able to select from a list of farms, and have it link
(insert farm's id as a foreign key), I have currently setup my
belongsto relationship so I can view but I cannot add.

my original thought was to create a $options array and just loop
through the table, but I cannot do that if I do not have access to the
farms table.

Help!

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