Drop Down Lists that use the same list but removes the previous selection

[abmobile1981]

I am trying to create a form that has 8 drop down lists. They are all pulling from the same list, but I  want when you open the second drop down list, you not be able to select the same as before. Simple example is as follows;

DDL1 : 1, 2, 3, 4 . User choses 3.

DDL2 : 1, 2, 4. User choses 1.

DDL3: 2, 4. User choses 2.

I have included the basic form I am working with so the complication of this can be seen. But I do not even know where to start as far as coding goes.

[Peru Bob]

I've moved this from the poorly named Community Help forum (which is the forum for issues using the forums) to the Get Started forum.

Please tell us what Adobe application you are using so that this can be moved to the proper forum for help.