relating two forms & external functions

I would like to create a form and an entry database where fields in form-2 are derived from entries from form-1.  I imagine this as a drop down box on form-2 where the values are pulled from the entries db of form-1 using a definable relationship.  How would I accomplish this?

 

Also, once entries are in the entries database, I would like to manipulate the data by creating custom functions (such as creating groups, mailing lists, add attributes to specific entries…) is there an easy way to add a button to a entries custom display that calls my own function to work with a specific entry?

It sounds like you need the "Data from Entries" feature: http://formidablepro.com/knowledgebase/using-data-from-entries-fields/

Let us know if that doesn't work for you.

Topic closed.