Taxonomy child terms as Select options in CCK form I have a vocabulary with parent-child terms. Every user is linked to a parent term in their profile field. And, I have CCK that the users fill in. 

I need to add a Select Field with options as Child terms of a parent term that the User is linked to. (and save as term ref preferably)
How do I achieve this?

Vocabulary: "Sites"
ONE
 -a
 -b
 -c
TWO
 -d
 -e
THREE
 -f
 -g

User1 =&gt; profile field term ref =&gt; "ONE"
User2 =&gt; profile field term ref =&gt; "TWO"

CCK type: "Study"
node/add/study  =&gt;  select field (term ref) =&gt; "Select Site"
for User1 =&gt; Select site options =&gt; a, b, c
for User2 =&gt; Select site options =&gt; d, e
For this you can add a term reference field and use the full vocab. Then you will need to do a form alter hook in one of your custom module and filter out options based on logged in user.