Here is what I do.

Your page should have one form only. 

Make 2 divs. Top div has your fixed fields including the one that triggers the 
variable content. 

Use jquery to catch the change event for the field. When the field changes send 
an Ajax request to the server. 

Let the server build the variable form and return it to the server to populate 
the second div.

I build the individual form elements rather than using FORM or SQLFORM. That 
way I avoid form within a form problems.

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